Meleagrin is an antibiotic derived from a deep ocean, penicillin-producingP. chrysogenum.

Melanocyte-stimulating hormone release-inhibiting factor (MSH-R-IF) is a hypothalamic tripeptide that binds to rat striatum (Kd = 4.69 nM) and has diverse biological activities.

Meclizine is a histamine H1 receptor antagonist used to treat nausea and motion sickness.

Mebendazole is a synthetic benzimidazole derivate and anthelmintic agent. Mebendazole interferes with the reproduction and survival of helminths by inhibiting the formation of their cytoplasmic microtubules, thereby selectively and irreversibly blocking g

Meayamycin is an analogue of FR901464 that binds to the splicing factor 3b (SF3b) complex and inhibits pre-mRNA splicing, shows picomolar antiproliferative activity against various cancer cell lines and multidrug-resistant cells..

MDA 19 is a selective human CB2 receptor agonist with Ki of 43.3 nM.

MCT1-IN-4a is a potent, selective monocarboxylate transporter 1 (MCT1) inhibitor with IC50 of 90 nM.

MCOPPB 3Hcl is a nociceptin receptor agonist with pKi of 10.07; weaker activity at other opioid receptors.

Mcl-1-Puma inhibitor 8 is a small-molecule dual-acting compound that targets the apoptotic Mcl-1-PUMA interface with Ki of 0.3 uM (Mcl-1, FPA), reduces multiple cancer cells and inhibits PUMA-mediated apoptosis.

Mcl1-IN-2 is an Mcl-1 inhibitor without a reported IC50 value..

MCL0129 is a selective, potent melanocortin-4 receptor (MC4R) antagonist with Ki of 7.9 nM, without affinity for MC1 and MC3.

Mca-DEVDAPK(Dnp)-OH is a substrate for caspase-3.

MC2884 is a novel hybrid, dual HAT/EZH2 inhibitor with IC50 of 3.27, 8.35 and 4.56 uM for CBP, KAT5 and p300, respectively.

MC-1575 is a potent and selective class IIa HDAC inhibitor with IC50 of 440 nM for maize HD1-A, displays >70-fold selectivity over HD1-B.

MBQ-167 is a dual Rac/Cdc42 inhibitor, with IC50s of 103 nM for Rac 1/2/3 and 78 nM for Cdc42 in MDA-MB-231 cells, respectively.

MB710 is a small-molecule p53 mutant Y220C stabilizer, binds tightly to the Y220C pocket and stabilizes p53-Y220C in vitro..

MARPIN is a novel ATR-Chk1 pathway inhibitor that inhibits hydroxyurea (HU)-induced phosphorylation of Ser345 on Chk1 with IC50 of 7.7 uM.

Maropitant is a neurokinin (NK1) receptor antagonist.

Maropitant citrate (Cerenia) is a selective neurokinin 1 receptor (NK1) antagonist for prevention of vomiting due to motion sickness in dogs..

Marinopyrrole A (Maritoclax) is a selective Mcl-1 antagonist. It binds to Mcl-1, but not Bcl-XL, and targets Mcl-1 for proteasomal degradation. Maritoclax disrupts the interaction between Bim and Mcl-1 with an IC50 of 10.1 μM.

Marimastat is a broad spectrum MMP inhibitor and selective TACE inhibitor

Marbostat-100 is a potent, selective HDAC6 inhibitor with Ki of 0.7 nM, displays >200-fold selectivity over HDAC1-5, and HDAC7-10.

Mapracorat (ZK 245186) is a potent, selective and non-steroid glucocorticoid receptor (GR) agonist with binding Ki of 1.9 nM.

MAP4K4-IN-44 is a potent, moderately selective small molecule MAP4K4 inhibitor with IC50 of 5 nM in LC3K assay, demonstrates favorable in vivo bioavailability in mouse..

MAP4K4-IN-37 is a potent, selective, orally active inhibitor of serine-threonine kinase MAP4K4 with IC50 of 0.4 nM.

Manidipine is a dihydropyridine L- and T-type calcium channel blocker.

Maltohexaose is a natural saccharide, and can be produced from amylose, amylopectin and whole starch.

MALT1 paracaspase inhibitor 3 is a potent, specific, covalent inhibitor of MALT1 paracaspase with Ki of 10 nM, exhibits 10-and 100-fold improved potency in vitro and in vivo compared with Z-VRPR-fmk.

MAL3-101 is a Hsc70 modulator that inhibits Hsp70 ATPase activity, exhibits antiproliferative activity in breast cancer cells SK-BR-3 with IC50 of 27 uM.

MAI-400 (MAI400) is a novel peptide inhibitor of APC-Asef interaction with Kd of 12 nM and IC50 of 0.25 uM.