1-(3-三氟甲基-5,6-二氢-8H-[1,2,4]三唑-[4,3-A]吡嗪-7-)-4-(2,4,5-三氟苯基)-1,3—丁二酮;4-氧-4-[3-(三氟甲基)-5,6-二氢[1,2,4]三唑[4,3-A]吡嗪-7(8H)-基]-1-(2,4,5-三氟甲基)丁基-2-酮;

(2Z)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazine-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-one;1-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-4-(2,4,5-trifluorophenyl)butane-1,3-dione;4-oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butan-2-one;rac-Sitagliptin 3-Ketone;4-oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,4,5-trifluorophenyl)butane-2-one;