Prostaglandin D2 (PGD2) is one of the major PGs actively produced in the brain of various mammals. Prostaglandin D2 is one of the most potent endogenous sleep promoting substances. PGD2 plays a protective role by suppressing inflammation.

β-Cryptoxanthin ((3R)-β-Cryptoxanthin), isolated from Satsuma mandarin orange, is an oxygenated carotenoid and a potent antioxidant. β-Cryptoxanthin has an anti-stress effect.

L-hydroxylysine dihydrochloride ((2S,5R)-5-Hydroxylysine dihydrochloride), an amino acid, is exclusive to collagen protein, which is formed by posttranslational hydroxylation of some lysine residues.

Mevalonic acid lithium salt, a precursor in the mevalonate pathway, is essential for cell growth and proliferation.

Cysteinylglycine TFA is an endogenous metabolite and used in disease diagnosis.

Tetrahydrocortisone is a stress-induced hormone. Tetrahydrocortisone is also a urinary metabolite of Cortisone derived from the reduction of Cortisone by 5-reductase.

Allotetrahydrocortisol (5a-Tetrahydrocortisol) is a metabolite of Cortisol. Cortisol is the main glucocorticoid in human. It is produced in adrenal cortex and plays a crucial role in many physiological processes.

7α-Hydroxy-4-cholesten-3-one is an intermediate in synthesis of bile acids from cholesterol. 7α-Hydroxy-4-cholesten-3-one is a pregnane X receptor (PXR) agonist. 7α-Hydroxy-cholest-4-en-3-one is a biomarker for bile acid loss, irritable bowel syndrome, and other diseases associated with defective bile acid biosynthesis. 7α-Hydroxy-cholest-4-en-3-one is the physiological substrate for CYP8B1.

FAPy-adenine is an oxidized DNA base. Fapy-adenine shows an increased trend levels in the Alzheimer's disease brain. Oxidized nucleosides are biochemical markers for tumors, aging, and neurodegenerative diseases.

Aldosterone is the primary mineralocorticoid. Aldosterone is a steroid hormone, and it is synthesized and secreted in response to renin-angiotensin system activation (RAS) or high dietary potassium by the zona glomerulosa (ZG) of the adrenal cortex. Aldosterone activity is dependent by the binding and activation of the cytoplasmic/nuclear mineralocorticoid receptor (MR) at cellular level.

2-Methylcitric acid (Methylcitric acid) is an endogenous metabolite in the 2-methylcitric acid cycle. 2-Methylcitric acid accumulates in methylmalonic and propionic acidemias and acts as a marker metabolite. 2-Methylcitric acid markedly inhibits ADP-stimulated and uncoupled respiration in mitochondria supported by glutamate.

2-Methylcitric acid trisodium (Methylcitric acid trisodium) is an endogenous metabolite in the 2-methylcitric acid cycle. 2-Methylcitric acid trisodium accumulates in methylmalonic and propionic acidemias and acts as a marker metabolite. 2-Methylcitric acid trisodium markedly inhibits ADP-stimulated and uncoupled respiration in mitochondria supported by glutamate.

Resolvin E1 (RvE1), a potent endogenous pro-resolving mediator of inflammation, is derived from omega-3 fatty acid eicosapentaenoic acid (EPA). Resolvin E1 is endogenously biosynthesized from EPA in the presence of Aspirin during the spontaneous resolution phase of acute inflammation, where specific cell-cell interactions occur. Resolvin E1 possesses unique counterregulatory actions that inhibit polymorphonuclear leukocyte (PMN) transendothelial migration. Resolvin E1 also acts as a potent inhibitor of leukocyte infiltration, dendritic cell migration, and IL-12 production.

11-Beta-hydroxyandrostenedione (4-Androsten-11β-ol-3,17-dione) is a steroid mainly found in the the adrenal origin (11β-hydroxylase is present in adrenal tissue, but absent in ovarian tissue). 11-Beta-hydroxyandrostenedione is a 11β-hydroxysteroid dehydrogenase (11βHSD) isozymes inhibitor. As 4-androstenedione increases, measuring plasma 11-Beta-hydroxyandrostenedione can distinguish the adrenal or ovarian origin of hyperandrogenism.

(±)20-HDHA ((±)20-HDoHE) is a racemic mixture and is an autoxidation product of Docosahexaenoic acid (DHA). (±)20-HDHA is also formed by peroxidation process in human platelets and rat brain homogenate.

Simvastatin ammonium is an active metabolite of simvastatin lactone mediated by CYP3A4/5 in the intestinal wall and liver (pKa=5.5). Simvastatin ammonium reduces indoxyl sulfate-mediated reactive oxygen species and modulates OATP3A1 expression in cardiomyocytes and HEK293 cells transfected with the OATP3A1 gene.

Hydroxy bosentan (Ro 48-5033) is a primary metabolite of Bosentan (BOS) metabolized by the cytochrome P450 system in the liver. Ro 48-5033 assists BOS pharmacologically, retaining 10%-20% activities.

Pentacosanoic acid is a 25-carbon long-chain saturated fatty acid. Pentacosanoic is a conjugate acid of a pentacosanoate.

Resolvin D1 (RvD1), an endogenous pro-resolving mediator of inflammation, is derived from omega-3 docosahexaenoic acid during the resolution phase of acute inflammation. Resolvin D1 blocks proinflammatory neutrophil migration by regulating actin polymerization, reduces TNF-α–mediated inflammation in macrophages, and enhances phagocytosis of apoptotic cells by macrophages.

SAICAR is an intermediate of de novo purine nucleotide biosynthesis, activates pyruvate kinase isoform M2 (PKM2) in an isozyme-selective manner, with an EC50 of 0.3 mM. SAICAR stimulates PKM2 and promotes cancer cell survival in glucose-limited conditions.

Lobeline sulfate (α-Lobeline sulfate; L-Lobeline sulfate) is a nonstimulant medication that can alter dopamine uptake in brain. Lobeline sulfate (α-Lobeline sulfate; L-Lobeline sulfate) inhibits nicotine-induced hyperactivity and is effective in smoking cessation.

cis-9,10-Epoxystearic acid (cis-9,10-Epoxyoctadecanoic acid) is an endogenous constituent in human blood and urine. cis-9,10-Epoxystearic acid (cis-9,10-Epoxyoctadecanoic acid) can be produced from oleic acid by enzymic and non-enzymic epoxidation.

D-methionine sulfoxide is the D-isomer of Methionine sulfoxide. Methionine sulfoxide is an oxidation product of methionine. Methionine is the limiting amino acid in milk or leguminous proteins , which is easily oxidized during the course of storage or processing.

N1,N8-Diacetylspermidine is a polyamines in the human urine. N1,N8-Diacetylspermidine is useful as prognostic indicators after treatment and during follow-up examination of cancer patients.

N1,N8-Diacetylspermidine hydrochloride is a polyamines in the human urine. N1,N8-Diacetylspermidine hydrochloride is useful as prognostic indicators after treatment and during follow-up examination of cancer patients.

5-Hydroxy-2'-deoxyuridine (5-OHdU) is a major stable oxidation product of 2'-Deoxycytidine. 5-Hydroxy-2'-deoxyuridine can be incorporated into DNA in vitro by DNA polymerase.

5-ALA benzyl ester hydrochloride (Benzyl-ALA hydrochloride) is a protoporphyrin precursor used as a photodetection agent. 5-ALA benzyl ester hydrochloride induces protoporphyrin IX (PPIX) accumulation in colon carcinoma cell lines.

Streptolysin O, a group A streptococcal toxin, is a well-characterized oxygen-labile prototype of a cholesterol-binding bacterial exotoxin. Streptolysin O causes both lysis of cells and cardiotoxicity. Streptolysin O is widely used for the controlled permeabilization of cell membranes. Streptolysin O exists in two forms, a reduced active state and an oxidized reversibly inactive state .

Iretol (2,4,6-trihydroxyanisole) is a a degradation product of a glucoside obtained from Iris Jorentina. Iretol is an intermediate in the synthesis of natural isoflavones, such as Tectorigenin, Irigenin and Caviunin.

L-Epinephrine hydrochloride ((-)-Epinephrine hydrochloride; L-Adrenaline hydrochloride; (-)-Adrenalin hydrochloride), an endogenous neurotransmitter hormone, is used for the treatment of allergic and respiratory disorders.

Ubiquinol (Ubiquinol-10) is a reduced form of coenzyme Q10 (CoQ10). Ubiquinol is a potent antioxidant that has the capacity to protect Vitamin E, and also helps to regenerate depleted vitamin E and Vitamin C. Ubiquinol is both lipophilic and hydrophilic and acts as transmembrane factor preventing lipid peroxidation and propagation by transferring electrons to ROS.

L-Carnitine hydrochloride ((R)-Carnitine hydrochloride), a highly polar, small zwitterion, is an essential co-factor for the mitochondrial β-oxidation pathway. L-Carnitine hydrochloride functions to transport long chain fatty acyl-CoAs into the mitochondria for degradation by β-oxidation. L-Carnitine hydrochloride is an antioxidant. L-Carnitine hydrochloride can ameliorate metabolic imbalances in many inborn errors of metabolism.

9-cis-Retinal is a natural retinoid. Dietary 9-cis-β-carotene generates 9-cis-retinoids via cleavage into 9-cis-retinal. 9-cis Retinal binds to cellular retinol-binding protein-I (CRBP-I) and CRBP-II with Kds of 8 nM and 5 nM, respectively. 9-cis-Retinal expedites differentiation and maturation of rod photoreceptors in retinal organoids.

L-Methionine sulfoxide (H-Met(O)-OH), a metabolite of Methionine, induces M1/classical macrophage polarization, and modulates oxidative stress and purinergic signaling parameters.

Tetradecanedioic acid is an endogenous metabolite and belongs to the class of organic compounds known as long-chain fatty acids. Tetradecanedioic acid can act as a candidate biomarker for organic anion-transporting polypeptide mediated drug-drug interactions .

N-Acetyl-L-glutamic acid, a N-acyl-L-amino acid, is a component of animal cell culturing media. N-Acetyl-L-glutamic acid is a metabolite of Saccharomyces cerevisiae and human.

L-Dihydroorotic acid can reversibly hydrolyze to yield the acyclic L-ureidosuccinic acid by dihydrowhey enzyme.

trans-Cinnamaldehyde can be used to prepare highly polyfunctionalized furan ring by reaction of alkyl isocyanides with dialkyl acetylenedicarboxylate. trans-Cinnamaldehyde can be used to synthesize trans-cinnamaldehyde -β-cyclodextrin complex, an antimicrobial edible coating that increases the shelf life of fresh-cut fruits.

SY-640 is an Acetamide derivative and has potent hepatoprotective effect. SY-640 reduces Propionibacterium acnes and Lipopolysaccharide-induced liver injury in mice.

Sphingosine-1-phosphate (S1P) is an agonist of S1P1-5 receptors and a ligand of GPR3, GPR6 and GPR12. Sphingosine-1-phosphate is an intracellular second messenger and mobilizes Ca2+ as an extracellular ligand for G protein-coupled receptors. Sphingosine-1-phosphate is an important lipid mediator generated from Sphingomyelin or other membrane phospholipids.

C16-PAF (PAF (C16)), a phospholipid mediator, is a platelet-activating factor and ligand for PAF G-protein-coupled receptor (PAFR). C16-PAF exhibits anti-apoptotic effect and inhibits caspase-dependent death by activating the PAFR. C16-PAF induces increased vascular permeability.

Lumisterol 3 (>90%) (9β,10α-Cholesta-5,7-dien-3β-ol) is a normal human secosterooid metabolite from the class of vitamin D3 photoisomer derivatives. Lumisterol 3 (>90%) is used in the preparation of vitamin D.

L-Sepiapterin (Sepiapterin) is a precursor of the endothelial nitric oxide synthase (eNOS) cofactor tetrahydrobiopterin (BH4). L-Sepiapterin improves endothelial dysfunction in small mesenteric arteries from db/db mice, and induces angiogenesis. L-Sepiapterin inhibits cell proliferation and migration of ovarian cancer cells via down-regulation of p70S6K-dependent VEGFR-2 expression.

(±)8-HETE is one of the six monohydroxy fatty acids produced by the non-enzymatic oxidation of arachidonic acid. The biological activity of (±)8-HETE is likely to resemble that of its constituent enantiomers (8(R)-HETE and 8(S)-HETE).

3α,7α-Dihydroxycoprostanic acid is an endogenous metabolite. 3α,7α-Dihydroxycoprostanic acid, a bile acid, is the precursor to chenodeoxycholic acid.

sn-Glycerol 3-phosphate biscyclohexylammonium salt is produced by cytosolic glycerol 3-phosphate dehydrogenase pathway through the reduction of dihydroxyacetone phosphate using NADH formed during glycolysis.

Isobutyryl-L-carnitine chloride is a product of the acyl-CoA dehydrogenases.

8-Isoprostaglandin F2α is an isoprostane produced by the non-enzymatic peroxidation of arachidonic acid in membrane phospholipids. 8-Isoprostaglandin F2α is present in human plasma in two distinct forms - esterified in phospholipids and as the free acid. 8-Isoprostaglandin F2α is a weak TP receptor agonist in vascular smooth muscle.

Diadenosine pentaphosphate pentasodium is an endogenous vasoactive purine dinucleotide which has been isolated from thrombocytes. Diadenosine polyphosphates (ApnA, n=2–7) have been identified as constituents of secretory vesicles such as in platelets, chromaffin cells, Torpedo synaptic terminals and brain synaptosomes.

Diadenosine pentaphosphate pentaammonium is an endogenous vasoactive purine dinucleotide which has been isolated from thrombocytes. Diadenosine polyphosphates (ApnA, n=2–7) have been identified as constituents of secretory vesicles such as in platelets, chromaffin cells, Torpedo synaptic terminals and brain synaptosomes.

Diadenosine pentaphosphate pentalithium is an endogenous vasoactive purine dinucleotide which has been isolated from thrombocytes. Diadenosine polyphosphates (ApnA, n=2–7) have been identified as constituents of secretory vesicles such as in platelets, chromaffin cells, Torpedo synaptic terminals and brain synaptosomes.

Succinyladenosine, the metabolic product of dephosphorylation of intracellular adenylosuccinic acid (S-AMP) by cytosolic 5-nucleotidase, is a biochemical marker of adenylosuccinase (ASL) deficiency.

2-Furoylglycine, a urinary metabolite in human, is a putative biomarker for coffee consumption.

11β-Hydroxyandrosterone is a 11-oxygenated androgen metabolite of 11β-hydroxyandrostenedione.

L-Glyceric acid is a mainly urinary metabolite accumulating in rare inherited metabolic disease L-glyceric aciduria. L-Glyceric acid can be used to diagnose primary hyperoxaluria type 2 (PH2). L-Glyceric acid excretion to distinguish PH1 from PH2.

L-Glyceric acid sodium is a mainly urinary metabolite accumulating in rare inherited metabolic disease L-glyceric aciduria. L-Glyceric acid sodium can be used to diagnose primary hyperoxaluria type 2 (PH2). L-Glyceric acid sodium excretion to distinguish PH1 from PH2.

Leukotriene C4 is the parent cysteinyl leukotriene produced by the LTC4 synthase catalyzed conjugation of glutathione to LTA4. Leukotriene C4 is produced by neutrophils, macrophages, mast cells, and by transcellular metabolism in platelets. Leukotriene C4 is one of the constituents of slow-reacting substance of anaphylaxis (SRS-A) and exhibits potent smooth muscle contracting activity.

11-Oxo etiocholanolone (11-Ketoetiocholanolone) is a metabolite of Etiocholanolone. Etiocholanolone is the excreted metabolite of testosterone and has anticonvulsant activity.

Acetyl Coenzyme A trisodium (Acetyl-CoA trisodium) is a central metabolic intermediate. Acetyl Coenzyme A trisodium is the actual molecule through which glycolytic pyruvate enters the tricarboxylic acid (TCA) cycle, is a key precursor of lipid synthesis, and is the sole donor of the acetyl groups for acetylation. Acetyl Coenzyme A trisodium acts as a potent allosteric activator of pyruvate carboxylase (PC).

γ-Globulins from human blood are a class of proteins in the blood. γ-Globulin is a protein fraction of blood serum containing many antibodies that protect against bacterial and viral infectious diseases. γ-Globulins from human blood is used for common variable immunodeficiency

neo-Inositol, a stereoisomer of inositol, has been isolated from calf brain.

α-D-Glucose-1-phosphate disodium hydrate is used as a starting material for synthesis of glucuronic acid. α-D-Glucose-1-phosphate disodium hydrate can be used as a cytostatic compound essential for cardiopathic therapy, as an antibiotic, as an immunosuppressive drug, and as a circulatory system therapy element.

Fructosyl-lysine (Fructoselysine) dihydrochloride is an amadori glycation product from the reaction of glucose and lysine by the Maillard reaction. Fructosyl-lysine dihydrochloride is the precursor to glucosepane, a lysine–arginine protein cross-link that can be an indicator in diabetes?detection.

4-Formylaminoantipyrine?is an excreted metabolite of?aminophenazone. Aminophenazone is a pyrazolone with analgesic, anti-inflammatory, and antipyretic effects in vivo.

Dichloroiodomethane is a natural compound in human beings.

trans-2-Hexadecenoyl-L-carnitine is an endogenous metabolite in urine.

[(3R)-3-Hydroxydodecanoyl]-L-carnitine is an endogenous metabolite.

NHC-diphosphate is an active phosphorylated intracellular metabolite of β-d-N4-Hydroxycytidine (NHC) as a diphosphate form. NHC is a pyrimidine ribonucleoside and behaves as a potent anti-virus agent. NHC effectively inhibits the replication of venezuelan equine encephalitis virus (VEEV), Chikungunya virus (CHIKV) and hepatitis C virus (HCV).

Ternidazole hydrochloride is a hydroxymetabolite of nitroimidazole, has antiprotozoic properties.

Toltrazuril sulfoxide is a short-lived intermediary metabolite of Toltrazuril, and then can be metabolized to the reactive toltrazuril sulfone (TZR-SO2) in vivo. Toltrazuril is an antiprotozoal agent that acts upon Coccidia parasites.

N-β-alanyldopamine hydrochloride (NBAD hydrochloride) is the major dopamine derivative in haemolymph.

2'-Deoxyadenosine-5'-triphosphate (dATP) is a nucleotide used in cells for DNA synthesis (or replication), as a substrate of DNA polymerase.

2'-Deoxyadenosine-5'-triphosphate trisodium (dATP trisodium) is a nucleotide used in cells for DNA synthesis (or replication), as a substrate of DNA polymerase.

Norepinephrine tartrate (Levarterenol tartrate), a naturally occurring chemical in the body that acts as both a stress hormone and neurotransmitter, is a β1-selective adrenergic receptor agonist with EC50 of 5.37 μM.

NT1-O12B, an endogenous chemical and a neurotransmitter-derived lipidoid (NT-lipidoid), is an effective carrier for enhanced brain delivery of several blood-brain barrier (BBB)-impermeable cargos. Doping NT1-O12B into BBB-impermeable lipid nanoparticles (LNPs) gives the LNPs the ability to cross the BBB. NT-lipidoids formulation not only facilitate cargo crossing of the BBB, but also delivery of the cargo into neuronal cells for functional gene silencing or gene recombination.

Methyl phenylacetate is an endogenous metabolite.

1,3-Butanediol, an ethanol dimer providing a source of calories for human nutrition. 1,3-Butanediol is converted in the body to β-hydroxybutyrate and has cerebral protective and hypoglycaemic effect.

S-Adenosyl-L-methionine tosylate (S-Adenosyl methionine tosylate) is produced endogenously from methionine and ATP by action of the enzyme methionine adenosyltransferase and is an important orally active methyl group donor. S-Adenosyl-L-methionine tosylate is a dietary supplement with potent antidepressant and analgesic effects, and has the potential for liver disease and osteoarthritis research.

Dehydroepiandrosterone sulfate sodium salt (DHEAS) is the most abundant circulating steroid in human. Dehydroepiandrosterone sulfate sodium salt (DHEAS) affects steroid hormone biosynthesis on a molecular level resulting in an increased formation of pregnenolone.

Allantoic acid is a degradative product of uric acid and associated with purine metabolism.

ATP dipotassium (Adenosine 5'-triphosphate dipotassium) is a central component of energy storage and metabolism in vivo, provides the metabolic energy to drive metabolic pumps and serves as a coenzyme in cells. ATP dipotassium is an important endogenous signaling molecule in immunity and inflammation.

Indole-2-carboxylic acid is a strong inhibitor of lipid peroxidation. Indole-2-carboxylic acid (I2CA) specifically and competitively inhibits the potentiation by glycine of NMDA-gated current.

Lumisterol (9β,10α-Ergosterol), a steroid compound, is the (9β,10α)-stereoisomer of Ergosterol. Lumisterol is a photoprotective agent against UVB-induced DNA damage and anti-proliferative activities.

D-Valine is the enantiomer of L-Valine. L-Valine is one of 20 proteinogenic amino acids. L-Valine is an essential amino acid.

Propylparaben sodium (Propyl parahydroxybenzoate) is an antimicrobial preservative which can be produced naturally by plants and bacteria. Propylparaben sodium is prevalently used in cosmetics, pharmaceuticals, and foods. Propylparaben sodium disrupts antral follicle growth and steroidogenic function by altering the cell-cycle, apoptosis, and steroidogenesis pathways. Propylparaben sodium also decreases sperm number and motile activity in rats.

(S)-Higenamine ((S)-Norcoclaurine), a S-enantiomer of Higenamine, is the entry compound in benzylisoquinoline alkaloid biosynthesis. (S)-Higenamine is produced by the condensation of dopamine and 4-hydroxyphenylacetaldehyde (4-HPAA) by norcoclaurine synthase (NCS).

(S)-Higenamine ((S)-Norcoclaurine) hydrobromide, a S-enantiomer of Higenamine, is the entry compound in benzylisoquinoline alkaloid biosynthesis. (S)-Higenamine hydrobromide is produced by the condensation of dopamine and 4-hydroxyphenylacetaldehyde (4-HPAA) by norcoclaurine synthase (NCS).

O-Desmethylangolensin is a metabolite of soy isoflavone, daidzein metabolized by gut microbiota. O-Desmethylangolensin possesses antioxidant activity.

Nε,Nε,Nε-Trimethyllysine chloride serves as a precursor for gut flora-dependent formation of N,N,N-trimethyl-5-aminovaleric acid (TMAVA).

all-trans-Anhydro Retinol (Anhydrovitamin A) is a metabolite of Vitamin A. all-trans-Anhydro Retinol is used in synthetic multivitamin preparations.

Orotidine 5′-monophosphate is a pyrimidine ribonucleoside and plays a role as an endogenous metabolite of human, E. coli or mouse. Orotidine 5′-monophosphate is an intermediate in the biosynthesis of?uridine monophosphate (UMP). Orotidine 5′-monophosphate can be used for the study of mechanism of orotidine 5′-monophosphate decarboxylase.

Enterostatin (human,mouse,rat) TFA is a pentapeptide mainly formed in the intestine by the cleavage of secreted pancreatic procolipase. Enterostatin ?selectively reduces fat intake, bodyweight, and body fat in vivo.

Atrial natriuretic factor (1-28) (human, porcine) (Atrial natriuretic peptide (1-28)) is an endogenous peptide produced by the heart, involved in blood pressure regulation. Atrial natriuretic factor (1-28) (human, porcine) produces natriuresis, diuresis and vasorelaxation in vivo.

Defensin HNP-1 human is a Human neutrophil peptides (HNPs), involved in endothelial cell dysfunction at the time of early atherosclerotic development.Defensin HNP-1 human can regulate the growth of atherosclerosis.

Defensin HNP-2 human is an endogenous antibiotic peptide and monocyte chemotactic peptide produced by human neutrophils.

Cecropin P1, porcine is an antibacterial peptide originally identified in moths (Hyalophora cecropia) and later in pig intestine.

D-Allothreonine is the D type stereoisomer of Allothreonine. D-Allothreonine is a peptido-lipid derived from bacteria. D-Allothreonine, amide-linked to the D-galacturonic acid, is also a constituent in the polysaccharide.

4-Carboxypyrazole is an endogenous metabolite.

2,6-Dimethylhydroquinone is an endogenous metabolite.

m-Anisaldehyde is an endogenous metabolite.

1,2-Cyclohexanedione is an endogenous metabolite.

2,4-Dihydroxybenzaldehyde is an endogenous metabolite.

Methyl 3-phenylpropanoate is an endogenous metabolite.

2-Hydroxy-4-methylbenzaldehyde is an endogenous metabolite.

3-Hydroxy-4-aminopyridine is an endogenous metabolite.

H-Val-Tyr-OH is an endogenous metabolite.

Dibenzyl disulfide is an endogenous metabolite.

D-Asparagine (H-D-Asn-OH) is a competitive inhibitor of L-Asparagine hydrolysis with a Ki value of 0.24 mM. D-Asparagine is a source of nitrogen for yeast strains. D-Asparagine is a good substrate for the external yeast asparaginase but is a poor substrate for the internal enzyme.

Sulcatone is an endogenous metabolite.

Imidazol-1-yl-acetic acid is an endogenous metabolite.

3-Hydroxybutyric acid sodium (β-Hydroxybutyric acid sodium) is a metabolite that is elevated in type I diabetes. 3-Hydroxybutyric acid sodium can modulate the properties of membrane lipids.

2,3,5-Trimethylpyrazine is an endogenous metabolite.

2-Methylcyclohexanone is an endogenous metabolite.

Tetrahydrothiophen-3-one is an endogenous metabolite.

Monobenzyl phthalate (2-((Benzyloxy)carbonyl)benzoic acid) is the urinary metabolite exposuring to phthalates, such as, diethylhexyl phthalate (DEHP).

N-Acetyl-L-tryptophan is an endogenous metabolite.

DL-Tryptophan is an endogenous metabolite.

Benzylideneacetone is an endogenous metabolite.

4-Ethylbenzaldehyde is an endogenous metabolite.

2-Methylacetophenone is an endogenous metabolite.

p-Tolualdehyde is an endogenous metabolite.

D-Threonine (H-D-Thr-OH) is an enantiomer of L-threonine. D-Threonine is a metabolite of Saccharomyces cerevisiae.

2-Thiophenecarboxaldehyde is an endogenous metabolite.

3-Amino-2-oxazolidinone (AOZ) is the metabolite of Furazolidone. 3-Amino-2-oxazolidinone is always be detected as a indicator of furazolidone residues in vivo.

3-Methyl-2-cyclopenten-1-one is an endogenous metabolite.

3-Phenoxybenzoic acid is an endogenous metabolite.

2,4-Di-tert-butylphenol is an endogenous metabolite.

2-Naphthoxyacetic acid is an endogenous metabolite.

Acetylvaline is an endogenous metabolite.

2',4'-Dimethylacetophenone is an endogenous metabolite.

1,4-Dimethoxybenzene is an endogenous metabolite.

4-Ethoxyphenol is an endogenous metabolite.

4-Hydroxybenzyl cyanide is an endogenous metabolite.

4-Amino-L-phenylalanine is an endogenous metabolite.

L-Cysteine hydrochloride hydrate is a conditionally essential amino acid, which acts as a precursor for biologically active molecules such as hydrogen sulphide (H2S), glutathione and taurine. L-Cysteine hydrochloride hydrate suppresses ghrelin and reduces appetite in rodents and humans.

4-Methylbiphenyl is an endogenous metabolite.

2-Mercaptobenzothiazole is an endogenous metabolite.

Carveol is an endogenous metabolite.

Mesitaldehyde is an endogenous metabolite.

(Ethoxymethyl)benzene is an endogenous metabolite.

2-Phenylacetamide is an endogenous metabolite.

Methyl p-tert-butylphenylacetate is an endogenous metabolite.

Cyclohexaneacetic acid is an endogenous metabolite.

Meconine is an endogenous metabolite.

2-hydroxymethyl benzoic acid is an endogenous metabolite.

N4-Acetylcytidine is an endogenous metabolite.

Ethoxyacetic acid is an endogenous metabolite.

3,5-Dihydroxyacetophenone is an endogenous metabolite.

2-Methylbenzoxazole is an endogenous metabolite.

2-Acetyl-3-ethylpyrazine is an endogenous metabolite.

L-Alanyl-L-leucine is an endogenous metabolite.

2-Ethylpyrazine is an endogenous metabolite.

4-Methyl-1-phenyl-2-pentanone is an endogenous metabolite.

2-Piperidone is an endogenous metabolite.

N,N,O-Tridesmethylvenlafaxine is an endogenous metabolite.

L-Azetidine-2-carboxylic acid is an endogenous metabolite.

1-Methylhistamine dihydrochloride is a histamine metabolite.

Spinacine is an endogenous metabolite.

L-Prolylglycine is an endogenous metabolite.

4,4-Dimethoxy-2-butanone is an endogenous metabolite.

2,6-Dihydroxyacetophenone is an endogenous metabolite.

3-Indoleacetonitrile is an endogenous metabolite.

Phenoxyacetic acid is an endogenous metabolite.

1-Dodecanol is an endogenous metabolite.

D-Leucine is a more potent anti-seizure agent than L-leucine. D-leucine potently terminates seizures even after the onset of seizure activity. D-leucine, but not L-leucine, reduces long-term potentiation but had no effect on basal synaptic transmission in vitro.

2-Methylbenzaldehyde is an endogenous metabolite.

4-Pentenoic acid is an endogenous metabolite.

3,4-Dimethoxyphenethylamine is an endogenous metabolite.

Methoxyacetic acid is an endogenous metabolite.

Monomethyl phthalate is a phthalate metabolite. Monomethyl phthalate acts as a urinary biomarker of phthalates exposure and can be used as a standard for the determination of thyroid cancer and benign nodule.

Diphenyl disulfide is an endogenous metabolite.

Dimethyl sulfone is an endogenous metabolite.

Hydroxyacetone is an endogenous metabolite.

2,6-Dibromophenol is an endogenous metabolite.

sn-Glycerol 3-phosphate lithium is produced by cytosolic glycerol 3-phosphate dehydrogenase pathway through the reduction of dihydroxyacetone phosphate using NADH formed during glycolysis.

Dihydroxyacetone phosphate hemimagnesium hydrate is an important intermediate in lipid biosynthesis and in glycolysis. It is a biochemical compound involved in many metabolic pathways, including the Calvin cycle in plants and glycolysis. Dihydroxyacetone phosphate hemimagnesium hydrate is found to be associated with transaldolase deficiency, which is an inborn error of metabolism.

NHC-triphosphate tetrasodium is an active phosphorylated intracellular metabolite of β-d-N4-Hydroxycytidine (NHC) as a triphosphate form. NHC-triphosphate tetrasodium is a weak alternative substrate for the viral polymerase and can be incorporated into HCV replicon RNA.

ATP disodium trihydrate (Adenosine 5'-triphosphate disodium trihydrate) is a central component of energy storage and metabolism in vivo, provides the metabolic energy to drive metabolic pumps and serves as a coenzyme in cells. ATP disodium trihydrate is an important endogenous signaling molecule in immunity and inflammation.

13-cis-Vitamin A palmitate (13-cis-Retinyl palmitate) is a 13-cis isomer formed by vitamin A palmitate in corn flakes. 13-cis-Vitamin A palmitate has a biological activity of 75% of all-trans-vitamin A palmitate, the most biologically ac-tive form of vitamin A.

9-cis-Vitamin A palmitate (9-cis-Retinyl palmitate) is a 9-cis isomer formed by vitamin A palmitate in corn flakes. 9-cis-Vitamin A palmitate has a biological activity of 26% of all-trans-vitamin A palmitate, the most biologically ac-tive form of vitamin A.

Vitamin D3 octanoate is an octanoate ester of vitamin D3. Vitamin D3 is a naturally occuring form of vitamin D. Vitamin D3 induces cell differentiation and prevents proliferation of cancer cells.

Cortisol sulfate (Cortisol 21-sulfate) is a metabolite of Cortisol. Cortisol sulfate is a specific ligand for intracellular transcortin.

(R)-3-Hydroxybutanoic acid sodium ((R)-3-Hydroxybutyric acid) is a metabolite, and converted from acetoacetic acid catalyzed by 3-hydroxybutyrate dehydrogenase. (R)-3-Hydroxybutanoic acid sodium has applications as a nutrition source and as a precursor for vitamins, antibiotics and pheromones.

cis-4-Hydroxy-L-proline, a proline analogue, is an inhibitor of collagen production. cis-4-Hydroxy-L-proline could inhibit fibroblast growth by preventing the deposition of triple-helical collagen on the cell layer. cis-4-Hydroxy-L-proline also depresses

Linoleic acid, an omega-6 trans fatty acid (TFA), acts as a source of energy. Linoleic acid is an essential nutrient, adding in enteral, parenteral, and infant formulas. Linoleic acid can be used for heart diseases research.

DL-Glutamic acid is the conjugate acid of Glutamic acid, which acts as a fundamental metabolite. Comparing with the second phase of polymorphs α and β L-Glutamic acid, DL-Glutamic acid presents better stability.

L-Palmitoylcarnitine TFA, a long-chain acylcarnitine and a fatty acid metabolite, accumulates in the sarcolemma and deranges the membrane lipid environment during ischaemia.

DL-Asparagine is a racemic melange of the Aparagine L and D-enantiomers. DL-Asparagine has been used in growth-media for bacteria-growth.

6-Methyluracil (Pseudothymine), a metabolite of Uracil, can be used as an indicator of acetoacetyl-CoA (AACoA) accumulation. 6-Methyluracil exhibits antiradiation effect in vivo.

L-Uridine, isolated from the Polyporaceae fungus Poria cocos (Schw.), is an enantiomer of the normal RNA constituent D-uridine. L-uridine acts as a phosphate acceptor for nucleoside phosphotransferases.

Stearoyl-L-carnitine chloride is an endogenous long-chain acylcarnitine. Stearoyl-L-carnitine chloride is a less potent inhibitor of GlyT2. Stearoyl-L-carnitine chloride inhibits glycine responses by 16.8% at concentrations up 3 μM.

Orotidine, a nucleotide, is an intermediate in pyrimidine nucleotide biosynthesis in RNA and DNA. Orotidine is mainly found in bacteria, fungi and plants.

OMDM-1 is a potent, selective and metabolically stable inhibitor of anandamide cellular uptake (ACU), with a Ki of 2.4 μM.

OMDM-2 is a potent, selective and metabolically stable inhibitor of anandamide cellular uptake (ACU), with a Ki of 3.0 μM.

Lysophosphatidylcholine 18:2 (1-Linoleoyl-2-Hydroxy-sn-glycero-3-PC), a lysophospholipid, is a potential biomarker identified from insulin resistance (IR) polycystic ovary syndrome (PCOS). Low plasma Lysophosphatidylcholine 18:2 also has been shown to predict impaired glucose tolerance, insulin resistance, type 2 diabetes, coronary artery disease, and memory impairment.

Sodium 3-methyl-2-oxobutanoate is a precursor of pantothenic acid in Escherichia coli.

3,5-Dimethylbenzaldehyde is a building block in the chemical synthesis.

Myristelaidic acid (trans-9-Tetradecenoic acid), a 14-carbon trans fatty acid, is the trans isomer of Myristoleic acid. Myristelaidic acid is found in most animal fats.

Taurohyodeoxycholic acid is the tauroconjugated form of Hyodeoxycholic acid (HDCA, a dihydroxylated natural bile acid). Taurohyodeoxycholic acid induces a biliary phospholipid secretion and suggests a hepatoprotective potential. Taurohyodeoxycholic acid also can promote gallstone dissolution.

Alkaline phosphatase is a membrane-bound glycoprotein that catalyzes the hydrolysis of phosphate monoesters at basic pH values. Alkaline phosphatase can be used for molecular biology and enzyme immunoassay.