The clerodane class of natural products are diterpenes that exhibit wide-ranging structural diversity.[1] Over 150 new bioactive clerodanes have been reported since 2002.[2] Of particular interest are asmarinesA (1) and B (2)[3] and popolohuanone E (3),[4] members of this class of natural products that exhibit potent antiproliferative activity against several types of human-cancer-cell lines (Scheme 1).[5] Popolohuanone E is a topoisomerase II ...