Abstract
Two novel zierane-type sesquiterpenes, named melicodenones A and B (1 and 2, resp.), and three new guaiane-type sesquiterpenes, named melicodenones C-E (3-5), were isolated from the root of Melicope denhamii (Seem.) T. G. Hartley together with zierone (6). Their structures were established by extensive NMR-spectroscopic analyses. Compounds 1-6 were tested for cytotoxicity using human colon cancer DLD-1 cells, and melicodenone A (1) was found to exhibit moderate activity.
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