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.
H. D. Locksley, I. Moore and F. Scheinmann, J. Chem. Soc. C, 1966, 2265 DOI: 10.1039/J39660002265
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