3-(((2R,3S)-2-((R)-1-(3,5-bis(trifuoromethyl)phenyl)ethoxy)-3-(4-fuorophenyl)morpholino)methyl)-1H-1,2,4-triazol-5(4H)-one,3-(((2R,3S)-2-((R)-1-(3,5-bis(trifuoromethyl)phenyl)ethoxy)-3-(4-fuorophenyl)morpholino)methyl)-1H-1,2,4-triazol-5(4H)-one,"Labeled Aprepitant, intended for use as an internal standard for the quantification of Aprepitant by GC- or LC-mass spectrometry.",Aprepitant Stable Isotopes