Cordiachromes: a new group of terpenoid quinones from Cordia spp.

Cordia millenii contains six optically inactive benzoquinones, cordiachromes (A)–(F); (C) and (F) have a benzogeijerene skeleton and the others have a tricyclic benzocogeijerene structure; they are probably derived from a benzenoid precursor and geranyl pyrophosphate.