Bioassay-directed fractionation of the MeCOEt extract of Porella cordeana yielded drimenin [1] and aristolone [4], which were moderately toxic towards DNA-repair-deficient mutants of Saccharomyces cerevisiae. Three inactive sesquiterpenes, 7-ketoisodrimenin [2], 7-ketoisodrimenin-5-ene [3], and norpinguisanolide, were also obtained. Compounds 2 and 3 are new.

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http://dx.doi.org/10.1021/np50096a016DOI Listing

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