Telcagepant
Telcagepant ( INN ) ( code name MK-0974 ) is a calcitonin gene-related peptide receptor antagonist which was an investigational drug for the acute treatment and prevention of migraine , developed by Merck & Co . . 
<triplet> Telcagepant <subj> calcitonin gene-related peptide receptor antagonist <obj> instance of