PAC-14028 is a potent and selective transient receptor potential vanilloid type I (TRPV1) antagonist.

PAC1 (Compound PAC1) is a novel PROTAC antibody conjugate, more potent estrogen receptor-alpha (ERα) degrader compared to PROTAC without antibody conjugation..

P62-mediated mitophagy inducer (PMI) is a small molecule P62-mediated mitophagy inducer that activates mitophagy without recruiting Parkin or collapsing membrane potential and retains activity in cells devoid of a fully functional PINK1/Parkin pathway.

P53R3 is a novel p53 reactivator that restores sequence-specific DNA binding of the endogenously expressed p53(R175H) and p53(R273H) mutants in gel-shift assays.

P516-0475 is a novel chemical inducer of Streptococcus quorum sensing acts by inhibiting the pheromone-degrading endopeptidase PepO (IC50=10 uM).

p38 MAPK-IN-4 is a potent and selective inhibitor of p38 MAPK with IC50 of 68 nM for p38α, inhibits LPS-induced TNFα release in THP-1 cells with IC50 of 187 nM.

p32 inhibitor M36 is a novel small molecule inhibitor of p32 mitochondrial protein, binds directly to p32 and inhibits p32 association with LyP-1.

P053 (P-053, CerS1 inhibitor P053) is a potent, selective, orally active inhibitor of ceramide synthase 1 (CerS1) with IC50 of 0.5 uM, displays >10-fold selectivity for inhibition of CerS2, CerS4, CerS5, and CerS6.

Ozagrel(OKY-046) sodium salt is an antiplatelet agent working as a thromboxane A2 synthesis inhibitor.

Ozagrel HCl

Oxythiamine, an antimetabolite and a vitamin B1 antagonist, is a well-known thiamine antagonist and inhibitor of transketolase.

Oxythiamine chloride is a small molecule transketolase inhibitor with Kd of 33 nM, shows functional assay of human transketolase inhibition in HCT-116 cells with EC50 of 26 nM.

Oxybutynin is also a possible treatment of hyperhidrosis (hyper-active sweating) .

Oxybenzone is a benzophenone derivative used as a sunscreen agent.

Oxonic acid potassium salt is an inhibitor of uricase, oxonic inhibits the phosphorylation of 5-FU to 5-fluorouridine-5'-monophosphate catalyzed by pyrimidine phosphoribosyl-transferase in a different manner from allopurinol in cell-free extracts and inta

Oxibendazole

Oxfendazole

Oxcarbazepine inhibits the binding of [3H]BTX to sodium channels with IC50 of 160 μM and also inhibits the influx of 22Na+ into rat brain synaptosomes with IC50 about 100 μM.

Oxadiazon is a preemergent herbicide.

OX-14 is a highly potent farnesyl pyrophosphate synthase (FPPS) inhibitor with IC50 of 2.46 nM, with significantly lower binding affinity to hydroxyapatite.

o-vanillin (C29L.

OUP-16 is a potent H4R agonist with a considerable selectivity over H3R..

OUL35 derivative 32 is a potent and selective inhibitor of mono-ADP-ribosyltransferase PARP10/ARTD10 with IC50 of230 nM, rescues HeLa cells from ARTD10-induced cell death..

Otilonium Bromide is an antimuscarinic used as a spasmolytic agent.

Otamixaban(FXV673) is a potent (Ki = 0.5 nM), selective, rapid acting, competitive and reversible fXa inhibitor that effectively inhibits both free and prothrombinase-bound fXa.

OSMI-4 (OGT inhibitor 4b) is a novel potent, selective, cell-active O-linked N-acetylglucosamine transferase (OGT) inhibitor with EC50 of ~3 uM.

Orvepitant (GW823296) is a potent and selective, brain penetrant NK1 receptor antagonist with pKi of 10.2.

Orotic acid (6-Carboxyuracil)

ORM-10962 is a potent, highly selective sodium-calcium exchanger (NCX) inhibitor, significantly reduces inward/outward NCX currents with IC50 of 55 and 67 nM, respectively.

Orita-13 is potent inhibitor of Migration inhibitory factor (MIF) tautomerase activity with Ki of 17 uM..