英文别名Sitagliptin Impurity 9; (Z)-methyl 3-acetamido-4-(2,4,5-trifluorophenyl)but-2-enoate; (Z)-methyl-3-N-acetylamino-4-(2,4,5-trifluorophenyl)but-2-enoate; (2Z)-3-(Acetylamino)-4-(2,4,5-trifluorophenyl)-2-butenoic acid methyl ester; methyl (Z)-3-acetamido-4-(2,4,5-trifluorophenyl)but-2-enoate; Methyl (2Z)-3-(acetylamino)-4-(2,4,5-trifluorophenyl)-2-butenoate 
