Chemical Name: (R)-3-Amino-4-(2,5-difluorophenyl)-1-(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)butan-1-one
Synonym: Sitagliptin 4-Desfluoro Impurity ; 2,5-Difluoro Sitagliptin (USP)
Smile: O=C(N1CC2=NN=C(C(F)(F)F)N2CC1)C[C@@](N)([H])CC3=C(F)C=CC(F)=C3