A new spiroketallactone, epi-danshenspiroketallactone A (1) and a new C18-norditerpenoid, normiltioane (2) along with 21 known compounds, were isolated from cell cultures of Salvia miltiorrhiza. Their structures were elucidated on the basis of extensive spectroscopic analyses. In the in vitro assays, the compounds 9-11, 21-23 exhibited the significant antitumor activity with the IC(50) ranges of 1.0-8.3 µM.
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Zhang et al. (2013) studied this question.
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