英文别名1,2,4-Triazolo[4,3-a]pyrazine, 5,6,7,8-tetrahydro-7-nitroso-3-(trifluoromethyl); N-NitrosoSitagliptinImpurity; Sitagliptin Impurity 174; Nitroso-STG-19 (Sitagliptin); N-Nitroso Sitagliptin Amine; Nitroso Sitagliptin STG-19; N-Nitroso Sitagliptin Impurity 20