Abstract
Phytochemical investigations on the organic extracts of the leaves of Suregada multiflora have led to the isolation of ten tetracyclic diterpene lactones 1– 10 , members of a rare class of abiatene diterpene lactones. Compounds 1– 5 were found to be new. The structures of gelomulides F ( 11 ), D ( 12 ) and E ( 13 ) were revised on the basis of 2D NMR and X-ray diffraction evidences. Compounds 1 and 2 contain an epoxy linkage between C-8 and C-14, whereas compounds 3– 5 were identified as 8,14-dihydroxy analogues of diterpene lactones. The stereochemical assignments in new compound 1 are based on X-ray diffraction analysis. Compounds 6 and 7 were identified as the known gelomulides A , G . The structures of compounds 7– 9 were unambiguously confirmed by X-ray diffraction analyses.
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