Sitagliptin FP Impurity A

Sitagliptin FP Impurity A ;sitagliptin fumarate adduct ; N-[(2R)-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-yl]aspartic acid ;