Chemical investigation of ceylonese plants. Part VIII. Trapezifolixanthone, a new di-isoprenylated xanthone from the bark of Calophyllum trapezifolium Thw. (Guttiferae)

Abstract
From the bark extractives of Calophyllum trapezifolium Thw. calabaxanthone (I), taraxerol, β-simiarenol, β-sitosterol, and a new xanthone, trapezifolixanthone (III) have been isolated. The latter has been shown to be 5,10-dihydroxy-2,2-dimethyl-12-(3-methylbut-2-enyl)pyrano[3,2-b]xanthen-6(2H)-one.

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