Synonyms: 1,2,4-Triazolo[3,4-c][1,4,7]triazecine-8,12(5H,9H)-dione, 6,7,10,11-tetrahydro-3-(trifluoromethyl)-10-[(2,4,5-trifluorophenyl)methyl]-, (10R)- (ACI), Sitagliptin Tablets Impurity FP-B (EP), (10R)-3-(Trifluoromethyl)-10-[(2,4,5-trifluorophenyl)methyl]-6,7,