Norcepharadione B
Norcepharadione B, a natural product isolated and purified from the herbs of Houttuynia cordata Thunb. with good inhibitory activity against the replication of HSV-1, exhibits significant cytotoxicity against five human tumor cell lines (A-549, SK-OV-3, SK-MEL-2, XF-498 and HCT-15) in vitro.