Anthraquinones and Xanthones from Cratoxylum glaucum (Guttiferae)

In a continuing search for xanthones and quinones from the guttiferae family, we decided to look at the genus cratoxylum. a detailed chemical study on cratoxylum glaucum has led to the isolation of two triterpenoids, friedelin(1) and stigmasterol (2), two an thraquinones 1,8-dihydroxy-6-methyl-3-methoxyanthraquinone (3) and vismiaquinone (4) and one xanthone dimethylmangostin (5). these compounds were identified using the 1d and 2d nmr spectroscopy. this is the first report done on the chemistry of cratoxylum glaucum;