Extractives from guttiferae. Part IV. Isolation and structure of ugaxanthone and mbarraxanthone from Symphonia globulifera L.

Abstract
Two xanthones isolated from Symphonia globulifera L. have been named ugaxanthone and mbarraxanthone and shown to be 4-(3,3-dimethylallyl)-1,3,5,6-tetrahydroxyxanthone(Ia) and 4-(3,3-dimethylallyl)-1,3,7-trihydroxyxanthone (IVa). The synthesis of mbarraxanthone dimethyl ether (IVb) is reported.

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