A new seco-friedelolactone, named itoaic acid, together with 5 known compounds was isolated from the bark and twigs of Itoa orientalis. The structure was elucidated by means of MS, 1D and 2D NMR techniques. Anti-inflammatory activity against COX-2 was evaluated for several compounds from I. orientalis and another Flacourtiaceae plant Xylosma controversum.
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