Sitagliptin 4-Desfluoro Impurity ;
(R)-4-Oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]-1-(2,5-difluorophenyl)butan-2-amine ;
CAS # 486460-31-5 (base) ; 1345822-87-8 (phosphate salt) ;
C16H16F5N5O (base) ;
MW: 389.32 ;