Three New Caged Prenylxanthones from Garcinia bracteata

[摘要]：Three new caged prenylxanthones (xanthone = 9H-xanthen-9-one), named neobractatin (1), 3-O-methylneobractatin (2), and 3-O-methylbractatin (3), along with eight known compounds, were isolated from the twig of Garcinia bracteata. The structures of the new compounds were elucidated on the basis of 1D- and 2D-NMR experiments, including HMBC, HSQC, H-1,H-1-COSY, and ROESY, as well as HR-MS analysis.

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