Sparfloxacin Impurity 6

Sitagliptin 4-Desfluoro Impurity ; (R)-4-Oxo-4-[3-(trifluoromethyl)-5, 6-dihydro[1, 2, 4]triazolo[4, 3-a]pyrazin-7(8H)-yl]-1-(2, 5-difluorophenyl)butan-2-amine phosphate ;