P2L-003 is a selective PAR2 antagonist with an IC50 of 0.62 μM in HT-29 cells. P2L-003 blocks PAR2-mediated Ca2+ mobilization without affecting PAR1, PAR4, or ATP-mediated signaling and dose-dependently suppresses the downstream MAPK signaling cascades, including ERK1/2 and p38 phosphorylation. P2L-003 can be used for colon cancer research.

P-1946 is a HIV protease inhibitor with a human HIV-1 protease Ki of 2.600 nM. P-1946 has potent and selective in vitro antiviral activity and retains full antiviral activity against HIV isolates resistant to commercially available protease inhibitors. P-1946 can be used for the research of human immunodeficiency virus type 1 (HIV-1) infection.

OZD-MET 01 is a chaperone-med iatedprotein PROTAC-type MET degrader. OZD-MET 01 can inhibit proliferation of H596 and H1437 cells with IC50 values of 3.07 and 3.5 μM. OZD-MET 01 can be used for the research of cancer, such as non-small cell lung cancer. (Structure Note: Pink: MET ligand; Blue: chaperone ligand; MET ligand-Linker:)

Oxazole-4-carboxylic acid (1,3-Oxazole-4-carboxylic acid) is a metal-organic framework (MOF).

OV329 hydrochloride is a potent GABA aminotransferase inactivator. OV329 hydrochloride is a Vigabatrin analogue. OV329 hydrochloride can increase brain GABA levels and block abnormal intracerebral hyperexcitability. OV329 hydrochloride exhibits anticonvulsant and antiepileptic activities. OV329 hydrochloride can be used for the research of neurological disease, such as seizure.

OTOP1-IN-1 (compound C2.2) is a potent zebrafish Otopetrin 1 (OTOP1) inhibitor with an IC50 of 6.67 µM. OTOP1-IN-1 exhibits selectivity for zebrafish OTOP1 over mOTOP1 and hOTOP1.

OT-7100 is an orally active analgesic agent. OT-7100 inhibits hyperalgesia possibly by enhancing adenosinergic neurotransmission in the dorsal horn. OT-7100 can be used for the researches of inflammation, neurological and metabolic disease such as diabetes2].

Osutidine is a selective histamine H2 receptor antagonist, can effectively inhibit histamine-stimulated gastric acid secretion. Osutidine does not affect [14C]aminopyrine accumulation stimulated by carbachol or dibutyryl-cAMP. Osutidine is insurmountable and includes non-competitive inhibition. Osutidine can be used for the study of gastric mucosal injury.

Osaterone acetate is an orally active steroid anti-androgen agent, mainly used for benign prostatic hyperplasia (BPH) in dogs. Osaterone acetate competitively antagonizes androgen receptor and inhibits 5α-reductase, reducing the concentration of dihydrotestosterone (DHT) while blocking the growth-stimulating effects of testosterone and DHT on prostate cells. Osaterone acetate can rapidly alleviate the symptoms of BPH in dogs without affecting the fertility of breeding dogs.

ortho-Topolin riboside is a naturally occurring cytokinin secreted from Populus x robusta leaves after sunrise. ortho-Topolin riboside has shown unique cytotoxic activity against NCI60 cell lines compared with the activity of other cytokinins.ortho-Topolin riboside induced differentiation through inhibition of STAT3 signaling in acute myeloid leukemia HL-60 cells.

ORG-25435 is an alpha amino acid phenolic ester derivative. ORG-25435 has intravenous anesthesia activity. ORG-25435 can be used for anesthesia related research.

Org20599 methanesulfonate is a direct agonist of the GABAA receptor with an EC50 of 1.1 μM. Org20599 methanesulfonate can be used in the research of neurological disorders.

Orexin receptor antagonist 6 (Compound 72) is a selective orexin 1 receptor (OX1) antagonist with a Ke of 8.5 nM and > 1180-fold selectivity for OX2. Orexin receptor antagonist 6 does not produce its own conditioned place preference (CPP) or aversive effects, and can inhibit the formation of CPP induced by psychoactive substances. Orexin receptor antagonist 6 can be used for research of neurological disease.

OPN-9643 is a covalent inhibitor targeting the central palmitate binding pocket of TEADs with an IC50 of 15 nM, preventing autopalmitoylation and reducing TEAD-driven luciferase activity and canonical TEAD targets, CTGF and CYR61. OPN-9643 can be used for the research of cancer, such as melanoma.

OPC-18750 is a novel positive inotropic agent and 2(lH)-quinolinone derivative. OPC-18750 displays positive inotropic and coronary vasodilating effects.

Opc-15161 is a novel superoxide generation inhibitor and major degradation product of OPC-15160.

OPC 8490 is a stimulant. OPC 8490 has a positive inotropic effect. OPC 8490 can be used for research on heart failure.

OP-1690 is a complete estrogen receptor (ERα) antagonist (CERAN), with pIC50 values of 7.5 and 7.9 in alkaline phosphatase (AP) activity assay and TR-FRET assay, respectively. OP-1690 modulates receptor function by inducing ERα tetramerization, effectively induces ERα degradation, inhibits target gene transcription, but exhibits low antiproliferative potency. OP-1690 can be used for breast cancer research.

ONO-2921 is an orally active and selective N-type calcium channel blocker. ONO-2921 functionally blocks N-type calcium channels. ONO-2921 reduces paw withdrawal responses during persistent nociception and hyperalgesia to heat in neuropathic pain models. ONO-2921 can be used for research on neuropathic pain and nociceptive pain.

Omtriptolide sodium (PG490-88Na) is a derivative of Triptolide. Omtriptolide sodium exhibits significant immunosuppressive, anti-fibrotic and anti-inflammatory properties. The mechanism of action of Omtriptolide sodium is diverse, including inhibiting T cell activation and proliferation, inducing T cell apoptosis (apoptosis), blocking fibroblast maturation/proliferation, inhibiting TGF-β mRNA expression, and suppressing pro-inflammatory cytokines (such as IL-2, IFN-γ, TNF-α) by blocking transcription factors such as NF-κB. Omtriptolide sodium can be used for research on obstructive airway diseases, pulmonary fibrosis and graft-versus-host disease.

Omocianine (Omocyanine) is a fluorescence imaging agent and has the potential to detect malignant breast lesions.

Omigapil (CGP3466B free base), an orally active GAPDH nitrosylation inhibitor, abrogates Aβ1-42-induced tau acetylation, memory impairment, and locomotor dysfunction in mice. Omigapil has the potential for the research of Alzheimer's disease. Omigapil is a apoptosis inhibitor. Omigapil can be used for the research of congenital muscular dystrophy (CMD). Omigapil is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.

Omega-3 acid ethyl esters (P-OM3) is a omega-3 polyunsaturated fatty acid. Omega-3 acid ethyl esters can be used for the researches of severe hypertriglyceridemia and cardiovascular diseases.

Oltipraz metabolite M2, an active metabolite of Oltipraz, is an orally active HIF-1α inhibitor. Oltipraz metabolite M2 increases mitochondrial fuel oxidation and inhibits lipogenesis in the liver by dually activating AMPK in high-fat diet (HFD)-fed mice. Oltipraz metabolite M2 can be used for hepatic steatosis and steatohepatitis research.

Oleoylsulfamide is a cannabinoid receptor 1 inhibitor.

OK-1035 is a selective DNA-dependent protein kinase (DNA-PK) inhibitor with an IC50 of 100 μM.

OICR19451 is an orally active dual NUAK1/NUAK2 and MARK2/MARK3 kinase inhibitor, with IC50 values of 12 nM and 10 nM against NUAK1 and NUAK2, and 101 nM and 124 nM against MARK2 and MARK3, respectively. OICR19451 modulates the Hippo signaling pathway, increases the phosphorylation level of YAP, enhances the cytoplasmic localization of YAP/TAZ, and inhibits the expression of oncogenes. OICR19451 inhibits cancer cell growth, reduces metastasis, promotes tumor capsule formation, and improves mouse survival in an orthotopic breast cancer model. OICR19451 can be used for research related to triple-negative breast cancer.

OH14 is a cellular FLICE-like inhibitory protein (cFLIP) inhibitor and TNF-related apoptosis-inducing ligand (TRAIL) sensitizer. OH14 selectively binds to the DED1 pocket of cFLIP, disrupting its recruitment to the TRAIL-death inducing signalling complex without affecting procaspase-8 recruitment to FADD, allowing procaspase-8 activation. OH14 promotes TRAIL-mediated apoptosis and impairs cell viability in breast cancer systems when combined with TRAIL. OH14 can be used for the research of breast cancer.

Octoclothepine (Clorotepine), an analog of Clozapine, is a neuroleptic and antipsychotic agent. Octoclothepine exists in enantiomeric forms, where the (+)-form acts as an atypical antipsychotic, while the (-)-functions as a typical antipsychotic. (+)-Octoclothepine exhibits extremely high binding affinity for 5-HT₆ and 5-HT₇ receptors, with Ki values of 0.41 and 0.38 nM; the Ki values of (-)-Octoclothepine are 17.7 and 1.3 nM, respectively. Octoclothepine can be used in research related to schizophrenia.

Cholesterol-conjugated OC prodrug (Compound 1b) is an orally active cholesterol-bound prodrug of Oseltamivir carboxylate. Cholesterol-conjugated OC prodrug has a protective effect against influenza virus infection. The Oseltamivir carboxylate released by the Cholesterol-conjugated OC prodrug has a longer duration of circulation than the Oseltamivir carboxylate released from Oseltamivir. Cholesterol-conjugated OC prodrug can be used in influenza research.