Cowabenzophenones A and B, two new tetracyclo[7.3.3.33,11.03,7]tetradecane-2,12,14-trione derivatives, from ripe fruits of Garcinia cowa

Two new tetracyclo[7.3.3.33,11.03,7]tetradecane-2,12,14-trione derivatives, cowabenzophenones A (1) and B (2), were isolated from ripe fruits of Garcinia cowa Roxb. Their structures were determined by spectroscopic methods. The tetracyclo[7.3.3.33,11.03,7]tetradecane-2,12,14-trione skeleton from the Garcinia genus is reported for the first time.

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