MK-2048 is a potent inhibitor of HIV-1 integrase (IN) and IN mutant R263K with IC50 of 2.6 nM and 1.5 nM, respectively.

MK-2894 is a highly potent and selective second generation EP4 antagonist.

MK2-IN-1 is a potent, selecitve, non-ATP competitive MAPKAPK2(MK2) inhibitor with IC50 of 0.11 uM.

MK2-IN-1 is a potent, selecitve, non-ATP competitive MAPKAPK2(MK2) inhibitor with IC50 of 0.11 uM.

MK-3207 is a potent and orally bioavailable CGRP receptor antagonist (IC50= 0.12 nM; Ki value= 0.024 nM); highly selective versus human AM1, AM2, CTR, and AMY3.

MK-3281 is a potent and orally bioavailable inhibitor of HCV NS5B polymerase with IC50 of 6 nM.

MK-3697 is a third insomnia drug, currently being developed by Merck. MK-3697 is a potent and selective Orexin receptor antagonist with Ki = 0.95 nM.

MK-3901 is a potent, selective, orally active P2X3 antagonist with IC50 of 21 nM.

MK-4074 is a potent, liver-specific, orally active inhibitor of acetyl-CoA carboxylase ACC1 and ACC2 with IC50 of ~3 nM.

MK-4074 is a potent, liver-specific, orally active inhibitor of acetyl-CoA carboxylase ACC1 and ACC2 with IC50 of ~3 nM.

MK591(Quiflapon sodium) is a selective and specific 5-Lipoxygenase-activating protein (FLAP) inhibitor.

MK-6169 is a potent, pan-genotype HCV NS5A inhibitor with replicon EC90 of 1-33 nM, retains potency against common resistance-associated substitutions in the major genotypes.

MK-6240 is a positron emission tomography (PET) tracer for neurofibrillary tangles (NFTs), exhibiting high specificity and selectivity for binding to NFTs.

MK-6892 is a highly potential GPR109A agonist with Ki value of 4.0 nM.

MK-8033 is a potent, specific, dual c-Met/Ron kinases inhibitor with IC50 of 1/7 nM, also potently inhibits oncogenic c-Met activation loop mutants Y1230C, Y1230H and Y1235D with IC50 of 0.6-1.2 nM.

MK-8033 is a potent, specific, dual c-Met/Ron kinases inhibitor with IC50 of 1/7 nM, also potently inhibits oncogenic c-Met activation loop mutants Y1230C, Y1230H and Y1235D with IC50 of 0.6-1.2 nM.

MK-8141 (ACT-077825) is a novel potent, selective, direct Renin inhibitor for the treatment of cardiovascular disorders..

MK-8245 trifluoroacetate is a potent, selective liver-targeted stearoyl-CoA desaturase (SCD) inhibitor with IC50 of 3, 3 and 1 nM for rat, mouse and human SCD1 enzyme, respectively.

MK-8267 (SCH 2047069) is a potent, orally bioavailable, brain penetrant kinesin spindle protein (KSP) inhibitor with EC50 of 3 nM.

MK-8282 is a potent, selective, oral GPR119 agonist with EC50 of 10 and 58 nM for hGPR119 and mGPR119, respectively.

MK-8318 (MK8318) is a potent, selective, orally available CRTh2 receptor antagonist with Ki of 5 nM, shows nM potency in functional assay (cAMP IC50=8 nM, β-Arrestin IC50=3.5 nM.

MK-8325 is a potent, selective pan-genotype HCV NS5A inhibitor with IC50 of 15, 1 and 3 pM for GT1a, GT1b and GT2a, respectively.