Two new naphthoquinones, rhinacanthin-C (1) and rhinacanthin-D (2), ex
hibit inhibitory activity against cytomegalovirus (CMV), with EC(50) v
alues of 0.02 and 0.22 mu g/mL, respectively, against human CMV. They
were isolated from the medicinal plant Rhinacanthus nasutus (Acanthace
ae). The structures of the compounds were determined by analysis of th
eir spectroscopic data, in particular, 2D NMR.