Oseltamivir Phosphate is an inhibitor of influenza viral neuraminidase. It is also an antiviral used against influenza A and B. Oseltamivir was discovered at Gilead in 1997 using shikimic acid as a starting point for synthesis. The compound has promising anti-cancer activity. Oseltamivir Phosphate is slightly soluble in DMSO but sparingly soluble in water.