4-Methyl-3-hydroxyanthranilic acid (MHA) is a key precursor for the synthesis of Actinomycin D.

4-Methoxyphthalic acid is a metal-organic framework (MOF).

4-Hydroxytryptophol is an in vitro metabolite of psilocin, can be found in human liver microsomes and recombinant monoamine oxidase A systems. 4-Hydroxytryptophol is not detected in in vivo samples from mice or humans.

4-Hydroxyphenylacetylglutamic acid is a metabolite of Morus alba L.

4-Hydroxy-L-arginine is a arginine derivative.

4-Hydroxyalprenolol (Alp2b) is a metabolite of β-receptor blocker Alprenolol.

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.

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.

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

2α-Ferrocenylmethyl-DHT is a dihydrotestosterone-derived ferrocene-steroid conjugate. 2α-Ferrocenylmethyl-DHT inhibits the growth of various cancer cells. 2α-Ferrocenylmethyl-DHT induces S-phase cell cycle arrest in ovarian cancer cells, elevates intracellular iron levels, triggers ROS-dependent cell death, and disrupts the integrity of multicellular tumor spheroids of ovarian cancer cells. 2α-Ferrocenylmethyl-DHT can be used in the research of prostate cancer and ovarian cancer.

2-Tetralone (Beta-Tetralone) is a pro-apoptosis agent. 2-Tetralone targets MDM2 E3 ubiquitin kinase and Bcl-w anti-apoptotic protein and exhibits anticancer activity.