MK-0974

MK-0974 (Telcagepant) is a highly potent, selective, and orally bioavailable CGRP receptor antagonist with Ki values of 0.77 nM and 1.2 nM for human and rhesus CGRP receptors respectively. MK-0974 displays >1500-fold lower affinity for the canine and rat receptors. MK-0974 displays reversible and saturable binding to both SK-N-MC membranes and rhesus cerebellum with a K(D) of 1.9 nM and 1.3 nM, respectively.