Oseltamivir EP Impuruty EOseltamivir Impurity E(EP)Oseltamivir Methyl Ester HClOseltamivir EP Impurity E HClOseltamivir Impurity E(chloride)(3R,4R,5S)-methyl 4-acetamido-5-aminoOseltamiviracidmethylesterhydrochlorideOseltamivir Phosphate EP Impurity E HClOseltamivir acid methyl ester hydrochlorideOseltamivir Impurity(Oseltamivir EP Impurity E)