Sitagliptin deamino impurity 11253056-18-6100 % similar (2Z)-3-Amino-1-[5,6-dihydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-A]pyrazin-7(8H)-yl]-4-(2,4,5-trifluorophenyl)-2-buten-1-one767340-03-470 % similar 1-[5,6-Dihydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-A]pyrazin-7(8H)-yl]-4-(2,4,5-trifluorophenyl)-1,3-butanedione764667-65-463 % similar Sitagliptin486460-32-661 % similar Sitagliptin phosphate654671-78-054 % similar Sitagliptin phosphate monohydrate654671-77-952 % similar 3-(Trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-A]pyrazine486460-21-333 % similar 3-(Trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-A]pyrazine hydrochloride762240-92-632 % similar