libivirumab libivirumab libivirumab is a human monoclonal antibody directed against the hepatitis b virus. libivirumabmonoclonal antibodytypewhole antibodysourcehumantargethepatitis b surface antigenclinical dataatc codenoneidentifierscas number569658-79-3 nchemspidernoneuniij1r33h8x7achemical and physical dataformulac6598h10232n1788o2060s46molar mass149039.65 g·mol−1 ny (what is this?) (verify)