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.

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.

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.

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.

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.

NSP-DMAE-HEG-Giu-NHS (Fig.18) is an activated labeling reagent containing acridine ester, and it is a key component of Cyclosporine A tracers.

NSC127916 (compound Ib) is a 2,6-diaminopurine analogue of Methotrexate.

NS8593 is an SK channel (small conductance Ca2+-activated K+ channels) inhibitor. NS8593 reversibly inhibited recombinant SK3-mediated currents (human SK3 and rat SK3). NS8593 inhibits all the SK1-3 subtypes Ca2+-dependently (Kd = 0.42, 0.60, and 0.73 μM, respectively, at 0.5 μM Ca2+). NS8593 does not affect the Ca2+-activated K channels of intermediate and large conductance (hlk and hBK channels, respectively). NS8593 can also inhibit TRPM7 (melastatin-related TRP cation channel 7) (IC50 = 1.6 mM). NS8593 can be used for the study of central nervous system (CNS) related diseases.

NPFFR2 modulator-1 (compound 11) is a NPFFR2 modulator.

North-methanocarbathymidine (N-MCT) is a potent antiviral agent. North-methanocarbathymidine inhibits DNA synthesis. North-methanocarbathymidine demonstrates potent antiviral activity against HSV-1, HSV-2 and KSHV. North-methanocarbathymidine exhibits anticancer activity against colon adenocarcinoma expressing HSV-tk.

Norhyodeoxycholic acid (NHDCA) is a synthetic bile acid and a derivative of hyodeoxycholic acid (HDCA).

NMDAR blocker 1 is an NMDA receptor channel blocker with an IC50 of 5.0 μM. NMDAR blocker 1 exhibits fast on-off blockade kinetics and strong voltage dependence, and does not compete with glutamate or glycine. NMDAR blocker 1 prevents glutamate/NMDA-induced intracellular Ca2+ overload, modulates the glutamate-nitric oxide-cGMP pathway. NMDAR blocker 1 prevents in vitro excitotoxic neurodegeneration of cultured cerebellar and hippocampal neurons. NMDAR blocker 1 attenuates excitotoxic insult in an mouse model of hyperammonemia-induced excitotoxicity. NMDAR blocker 1 can be used for the research of neurodegenerative diseases.

NLX-219 is a selective agonist of the 5-HT1A with a pKi of 10.21. NLX-219 activates ERK1/2 phosphorylation, inhibits adenylyl cyclase activity, promotes β-arrestin recruitment. NLX-219 can be used for the research of neurological disease.

NLRP3-IN-87 is a selective and orally active NLRP3 inhibitor with a Kd of 0.23 μM. NLRP3-IN-87 binds directly to the NLRP3 NACHT domain, disrupts NLRP3-NEK7 and NLRP3-ASC interactions, inhibits ASC oligomerization, and blocks inflammasome assembly. NLRP3-IN-87 suppresses caspase-1 activation and IL-1β secretion. NLRP3-IN-87 exhibits anti-inflammatory and analgesic activity, reducing joint swelling, inflammation, and pain in an MSU-induced acute gout mouse model. NLRP3-IN-87 can be used for the research of gout.

NLRP3 modulator 7 (Compound 17B) is a NLRP3 inflammasome regulator. NLRP3 modulator 7 has inhibitory activity against IL-1b, and its IC50 is less than 500 nM.

NHS-Phosphine is an amine-reactive compound that can be used to derivatize primary amines of proteins or amine-coated polymer surfaces for ligation to azide-tagged molecules.

NEURL1B-IN-1 is a NEURL1B degrader with a Kd value of 46.2 nM. NEURL1B-IN-1 binds to Arg422 within the NHR2 domain of NEURL1B, triggers its autoubiquitination and proteasomal degradation, disrupts its interaction with DLL1, and attenuates the Notch signaling pathway. NEURL1B-IN-1 induces cell cycle arrest and apoptosis, and inhibits migration of hepatocellular carcinoma cells. NEURL1B-IN-1 is applicable to research related to hepatocellular carcinoma.

NEPP11 is a cyclopentenone prostaglandin analogue. NEPP11 can inhibit glutamate-induced HT22 cell death in mouse hippocampus and prevent manganese-induced apoptosis in PC12 cells. NEPP11 can activate Nrf2 and maintain MEK1/2 and ERK1/2 activity by inhibiting c-Raf downregulation. NEPP11 exerts a neuroprotective effect in a mouse model of focal cerebral ischemia caused by permanent middle cerebral artery occlusion.

N-Descyclopropanecarbaldehyde olaparib-CO-C9-NHBoc (Compound 6h) is a target protein ligand-linker conjugate that can be used for the synthesis of PROTACs, such as PROTAC PARP2 degrader-1.

N-Deacetylcolchicine tartrate is a microtubule polymerization inhibitor with an IC50 of 3 μM against bovine brain microtubules. N-Deacetylcolchicine tartrate is a derivative of Colchicine. N-Deacetylcolchicine tartrate can activate the GTPase activity of microtubules and can be used for the research of cancer.

N-Cholyl-L-leucine is a bile acid-amino acid conjugate, mainly produced by intestinal microorganisms. N-Cholyl-L-leucine can be used as a biomarker for premature infants and is also employed in the study of bile acid metabolism.

N-Chloroacetyl-L-tryptophan (Chloroacetyltryptophan) is a hydrolyzable tryptophan derivative. N-Chloroacetyl-L-tryptophan rapidly hydrolyzes to tryptophan in Pseudomonas aurantiaca cultures. N-Chloroacetyl-L-tryptophan increases the level of the antibiotic Pyrrolnitrin in Pseudomonas aurantiaca fermentation cultures.

N-Benzylsulfamide is a benzyl-substituted sulfamide reagent. N-Benzylsulfamide can be used as a synthetic precursor to generate dioxides of bicyclic thiadiazines.

NBD Sphingosine-1-phosphate (ammonium) is a sphosphingolipid.

NB-216 is an orally active and brain-penetrant BACE-1 inhibitor (IC50 = 17 nM). NB-216 has a strong inhibitory effect on cathepsin D (IC50 = 1 nM) and cathepsin E (IC50 = 0.4 nM). NB-216 can be used for the study of Alzheimer's disease.