Two new polyoxygenated triterpenoids, stachlic acid A (= (2α,3β)-2,3,23,29-tetrahydroxyolean-12-en-28-oic acid; 1) and stachlic acid B (= (2α,3α)-2,29-dihydroxy-3,23-[(1,1-dimethylmethylene)dioxy]olean-12-ene-28-oic acid; 2), were isolated from Stachyurus himalaicus var. himalaicus. Their structures were established by means of extensive spectroscopic studies and chemical evidence. The purified product 1 was found to have moderate in vitro cytotoxic activity against human Hela cells.
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Yang et al. (2006) studied this question.
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