... amino-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-7 ... -1-oneMolecular FormulaC16H15F6N5OMolecular Weight407.3136InChIInChI=1/C16H15F6N5O/c17-10-6-12(19)11(18)4-8(10)3-9( ... -27-13(7-26)24-25-15(27)16(20,21)22/h4,6,9H,1-3,5,7,23H2/t9-/m0 ...