Sumatriptan EP Impurity A

Sitagliptin Ketoamide Impurity ; (2Z)-4-Oxo-4-[3-(trifluoroMethyl)-5, 6-dihydro-[1, 2, 4] triazolo[4, 3-a]pyrazine-7(8H)-yl]-1-(2, 4, 5-trifluorophenyl)butan-2-one ;