aprepitant [ L 785,298,L785,298,MK 0869,(2R)-(1R)-3,5-bis(trifluoromethylphenyl)ethoxy)-(3S)-(4-fluoro)phenyl-4-(3-(5-oxo-1H,4H-1,2,4-triazole)methyl-morpholine,Emend,L-785,298,MK 0517,MK 869,MK-0517,MK-0869,MK-869,MK0517,Merck brand of aprepitant,fosaprepitant,fosaprepitant dimeglumine ] a bis(trifluoromethyl)morpholine; antagonist of RECEPTORS, NEUROKININ-1