Sitagliptin impurity H  

Chemical Name: 3-Amino-4-(3,4-difluorophenyl)-1-[5,6-dihydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-a]pyrazin-7(8H)-yl]-1-butanone

Synonym: 3-Amino-4-(3,4-difluorophenyl)-1-[3-(trifluoromethyl)-5H,6H,7H,8H-[1,2,4]triazolo[4,3-a]pyrazin-7-yl]butan-1-one

Smile: O=C(N1CC2=NN=C(C(F)(F)F)N2CC1)CC(N)CC3=CC=C(F)C(F)=C3