4-Guanidinobutanal is a nucleoside metabolite.

4E,14Z-Sphingadiene is a sphosphingolipid.

4-DMA-3'-OH-Chalcone (compound 24) is a synthetic chalcone derivative and selective cytotoxic agent.4-DMA-3'-OH-Chalcone reduces viability of endometriotic cells, while preserving or enhancing viability of eutopic endometrial cells.4-DMA-3'-OH-Chalcone can be used for the research of endometriosis.

4-Chlorobutyronitrile is a PROTAC linker that can be used in the synthesis of PROTACs.

4-Bromoisophthalic acid (4-Bromo-1,3-benzenedicarboxylic acid) is a metal-organic framework (MOF).

4-Boc-aminomethyl-piperidine is a PROTAC linker that can be used in the synthesis of PROTACs.

447C88 is an acyl-coenzyme A cholesterol acyltransferase (ACAT) inhibitor with an IC50 of 23 nM. 447C88 can reduce plasma cholesterol levels and can be used in the research of endocrine and metabolic diseases such as hyperlipidemia.

4-(2-Boc-aminoethyl)piperidine is a PROTAC linker that can be used in the synthesis of PROTACs.

5-C-phenethyl-DNJ is a selective α-glucosidase GAA inhibitor, with its Ki value for rhGAA being 0.81 μM. 5-C-phenethyl-DNJ exhibits extremely high selectivity for GANAB, GBA1, and GBA2. 5-C-phenethyl-DNJ can be used for the study of Pompe disease.

5-HT2C agonist-13 is an orally active, selective and brain-penetrant 5-HT2C receptor agonist with human 5-HT2C receptor EC50 of 16 nM, Ki of 20 nM. 5-HT2C agonist-13 functionally activates 5-HT2C receptors, reduces food intake, reduces body weight gain, and exhibits effects reversible by a selective 5-HT2C antagonist. 5-HT2C agonist-13 can be used for the research of obesity.

4-Methoxyisophthalic acid (4-Methoxy-1,3-benzenedicarboxylic acid) is a metal-organic framework (MOF).

41-O-Demethylrapamycin is a metabolite of Rapamycin produced by Bacillus megaterium.

3α,7α-Dihydroxycoprostane is a metabolite of cholest-4-en-3-one-7α-ol.

4-Demethoxy-7,9-di-epi-daunorubicin, a derivative of Daunorubicin, is an anthracycline antibiotics. 4-Demethoxy-7,9-di-epi-daunorubicin can bind to calf thymus DNA and forms a complex with the stacked DNA base pairs. 4-Demethoxy-7,9-di-epi-daunorubicin can inhibit prokaryotic nucleic acid polymerases, including E. coli DNA polymerase I and RNA polymerase. 4-Demethoxy-7,9-di-epi-daunorubicin can be used for researches of cancer and infection.

3α,7α-Dihydroxy-5β-cholestan-26-al is a nucleoside metabolite.

3tBu-Crown TFA is a chelator. 3tBu-Crown TFA chelates radiometals and couples to biological targeting moieties to facilitate targeted delivery of chelated radiometals.3tBu-Crown TFA can be used for the research of cancer.

3-Phospho-D-glycerate can be converted to 2-phospho-d-glycerate (2-PGA) via phosphoglycerate mutase.

3'-O-(2-Nitrobenzyl)-dCTP is a reversible terminator. 3'-O-(2-Nitrobenzyl)-dCTP can be recognized and incorporated by polymerases, thereby temporarily terminating primer extension during DNA synthesis. After incorporation into the extending DNA strand, 3'-O-(2-Nitrobenzyl)-dCTP temporarily halts the DNA polymerase extension reaction, and its 3'-O-(2-nitrobenzyl) blocking group can be removed by laser irradiation to regenerate a free 3'-OH for subsequent primer extension cycles. 3'-O-(2-Nitrobenzyl)-dCTP is applicable for resolving homopolymeric regions in DNA templates.

3-Methylcathinone (3-MMC) hydrochloride is an analogue of a psychoactive substance.

3'-Methoxy-4'-nitroflavone (MNF) is a specific aryl hydrocarbon receptor (AhR) antagonist. 3'-Methoxy-4'-nitroflavone activates AhR by inhibiting CYP1, the metabolic enzyme of the endogenous ligand FICZ, leading to the accumulation of FICZ. 3'-Methoxy-4'-nitroflavone reverses the anti-apoptotic effect of TCDD, attenuates the activation of Akt and Erk1/2 kinases and the expression of TGFα induced by TCDD. 3'-Methoxy-4'-nitroflavone can be used in research related to breast tumor promotion, rheumatoid arthritis, multiple sclerosis and inflammatory bowel disease.

3'-Fluorothymidine-5'-triphosphate tetrasodium (3'-FdTTP tetrasodium) is a dTTP analog. 3'-Fluorothymidine-5'-triphosphate tetrasodium inhibits the T4 DNA polymerases competitively with dTTP. 3'-Fluorothymidine-5'-triphosphate tetrasodium inhibits DNA synthesis by T4 wild-type, L98 and CB121 DNA polymerase.

3''-Deamino-3''-hydroxykanamycin B (NK-1012-1) is a kanamycin antibiotic. 3''-Deamino-3''-hydroxykanamycin B can be produced by S. tenebrarius. 3''-Deamino-3''-hydroxykanamycin B is effective against E. coli ATCC 25922 and E. coli CCARM 1A020, with MIC values of 128 μg/mL.

3-Boc-aminomethylazetidine is a PROTAC linker that can be used in the synthesis of PROTACs.

3-Boc-3,9-Diazaspiro[5.5]undecane (hydrochloride) is a PROTAC linker that can be used in the synthesis of PROTACs.

3-Benzylmalic acid (3-Benzylmalate) can be converted from 2-Benzylmalic acid through a HphCD-mediated hydroxyl isomerization reaction.

3-Benzyl-3,9-diazaspiro[5.5]undecane is a PROTAC linker that can be used in the synthesis of PROTACs.

3-Amino-5-hydroxybenzoic acid-13C is the 13C-labeled 3-Amino-5-hydroxybenzoic acid. 3-Amino-5-hydroxybenzoic acid is a biosynthetic precursor of the mC7N unit of ansamycin antibiotics, including ansatrienin A and geldanamycin, as well as the antitumor antibiotic mitomycin C. 3-Amino-5-hydroxybenzoic acid may be an early intermediate in the shikimic acid pathway from glucose.

349U85 hydrochloride is a vasodilator-cardiotonic agent.

3-[4-(2-Propyn-1-yloxy)phenyl]-2H-azirine (Compound AZ-9) is a reactive probe based on 3-phenyl-2H-azirine, enabling chemoselective bioconjugation of carboxyl residues in proteins with excellent labeling efficiency and specificity under both in vitro and in situ conditions in live cells.

3-(4-Carboxyphenyl)propanoic acid is a PROTAC linker that can be used in the synthesis of PROTACs.