Pentacyclic triterpenes from the leaves of Camellia hakodae Ninh.

Nine pentacyclic triterpene derivatives including new 3-O-cis-p-coumaroyl trichadenic acid B (1) and two new ursane-type triterpene derivatives, 11α,12-[1-(methyl)-2-(4-hydroxy-3-methoxyphenyl)ethane-1,2-dioxy]-urs-12-ene-3ß-ol (2) and 11α,12-[2-(methyl)-1-(4-hydroxy-3-methoxyphenyl)ethane-1,2-dioxy]-urs-12-ene-3ß-ol (3) were isolated from the leaves of Camellia hakodae Ninh., along with six known compounds (4-9). This is the first report on pentacyclic triterpenoids from this species. New compounds 1-3 and compound 7 were tested for cytotoxic activity against four human cancer cell lines (KB; Hep-G2; Lu; MCF-7) using the MTT assay to show moderate activity.