西他列汀杂质16; (Z)-2,2,2-三氟-N' - (哌嗪-2-亚基)乙酰肼;

Acetic acid, 2,2,2-trifluoro-, (2Z)-2-(2-piperazinylidene)hydrazide; (2Z)-2-(2-Piperazinylidene)hydrazide trifluoroacetate; 2,2,2-trifluoro-N'-[(2Z)-piperazin-2-ylidene]acetohydrazide; Sitagliptin Impurity 16;