Three types of sesquiterpenes from rhizomes of Atractylodes lancea

A rare tricyclic carbon skeleton-type. three eudesmane-type and four guaiane-type sesquiterpenes were isolated from the rhizomes of Atractylodes lancea. Compounds 1, 2 and 4 were evaluated for their cytotoxic effects against P388 and A549 cells but all were inactive.