... 1-oxo-4-(2,4,5-trifluorophenyl)butyl)-5,6,7,8-tetrahydor-3-(trifluoromethyl)-; Sitagliptin Intermediate; (2R ... )-4-oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin- ... Weight407.3136InChIInChI=1/C16H15F6N5O/c17-10-6-12(19)11(18)4-8(10)3-9(23)5-14( ... ,7,23H2/t9-/m0/s1CAS Registry Number486460-32-6;790712-60-6Molecular Structure Density1.614g/cm3Boiling point529. ...