Apetalactone, a new triterpene lactone from Calophyllum species
Abstract
Apetalactone, a new triterpene lactone isolated from Calophyllum apetalum Willd. and C. tomentosum T. Anders., has been shown to be 4,28-dihydroxy-3,4-secofriedelan-3-oic acid lactone (IIa).