Several novel bioactive components isolated from Chinese medicinal plants will be presented.These include novel maytansinoid tumor, inhibitors, some new ent-kaurane and rosane diterpenoids from Mallotus anomalus Meer et higgs bookcase Chun (Euphorbiaceae), as well asnovel insecticide, stemona alkaloids from Stemona parviflora C.H.Wright les benjamins ta?l? sweatshirt (Stemonaceae).
Both are native plants of Hainan island, Chine.2D NMR techniques such as mono and hetero-COSY, NOESY, COLOC as well as H-NMR line broadening effect were utilized for structure elucidation.The separation techniques, struture elucidations and bioassay results will be reported.