2-PMPA is a potent and selective inhibitor of glutamate carboxypeptidase II (GCPII) with an IC50 of 300 pM.

3-(4-Pyridyl)indole is a ROCK-I inhibitor (IC50 = 25 µM) that promotes cell spreading, inhibits membrane blebbing, and induces dissolution of actin stress fibers in a wound healing assay

3,3'-Diindolylmethane(DIM) is a major digestive product of indole-3-carbinol, a potential anticancer component of cruciferous vegetables.

3,4-Dicaffeoylquinic acid (3,4-DCQA) is a polyphenol with diverse biological activities.

3,4-Dimethoxycinnamic acid (O-Methylferulic acid) is a monomer extracted and purified from Securidaca inappendiculata Hassk. 3,4-Dimethoxycinnamic acid exerts anti-apoptotic effects on L-02 cells via the ROS-mediated signaling pathway. Anti-apoptotic effe

3,5-Dicaffeoylquinic acid (3,5-DCQA) is a natural phenolic compound that has been found in L. japonica, I. kaushue, and other plants.It has antioxidant, anti-inflammatory, and antiviral biological activities.

3-Acetylaconitine, aconitine, and deoxyaconitine are main toxic components of the roots of Aconitum pendulum.

3BDO is a new mTOR activator which can also inhibit autophagy.

3b-Hydroxy-5-cholenoic acid is a monohydroxy bile acid of endogenous origin and could be found in children with the syndrome of hepatic ductular hypoplasia.

3-Bromo-7-Nitroindazole is a more potent inhibitor of nNOS than 7-nitroindazole in vitro, is also potent against iNOS, inhibits rat nNOS, bovine eNOS, and rat iNOS with IC50 of 0.17, 0.86, and 0.29 uM..

3-Cyano-7-ethoxycoumarin is a fluorescent P450 substrate (excitation/emission wavelengths = 408/455 nm); metabolized to cyano-hydroxycoumarin.

3-Cyanochromone is a potent gram-negative bacteria WcbL protein inhibitor with IC50 of 28 uM in a competitive enzyme-inhibition model, shows inhibition constants Ki of 10 uM..

3-Deazaadenosine (hydrochloride) is an inhibitor of S-adenosylhomocysteine hydrolase, with a Ki of 3.9 µM; 3-Deazaadenosine has anti-inflammatory, anti-proliferative and anti-HIV activity.

3-deazaneplanocin A (DZNeP), an analog of adenosine, is a competitive inhibitor of S-adenosylhomocysteine hydrolase with Ki of 50 pM.

3-Ethoxy-5,6-dibromosalicylaldehyde is a potent and selective inhibitor of IRE1 endoribonuclease with IC50 of 0.12 uM.

3-Indolebutyric acid (IBA)

3-Methoxyphenylacetic acid is a monocarboxylic acid.

3-methyl toxoflavin. Toxoflavin acts as a pH indicator, changing between yellow and colorless at pH 10.5.

3-Methyl-2-oxovaleric acid is a neurotoxin, an acidogen, and a metabotoxin, and also an abnormal metabolite that arises from the incomplete breakdown of branched-chain amino acids.

3-Methyladenine (3-MA) is a selective PI3K inhibitor for Vps34 and PI3Kγ with IC50 of 25 μM and 60 μM.

3PO is a PFKFB3 (6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase) inhibitor; reduces glycolytic flux and suppresses glucose uptake.

3-pyridine toxoflavin is an impurity of toxoflavin.