Rifampicin-d11 (Rifampin-d11, Rifamycin AMP-d11) is the deuterium labeled Rifampicin (HY-B0272)[1]. Rifampicin is a potent and broad spectrum antibiotic against bacterial pathogens. Rifampicin has anti-influenza virus activities. Rifampicin shows anti-orthopoxvirus activity[2].