Oseltamivir D3 is a deuterium labeled Oseltamivir. Oseltamivir is an influenza virus neuraminidase inhibitor (NAI). Oseltamivir inhibits influenza A/H3N2, A/H1N2, A/H1N1, and B viruses with mean IC50s of 0.67, 0.9, 1.34 and 13 nM, respectively. Anti-influenza A and B agent.