Abstract
Eight new iridal-type triterpenoid derivatives, including two noriridals with ether bridge (1–2); two iridals lactone (3–4), four monocyclic iridals (5–8), together with five known iridals (9–14) were identified from the rhizome of Belamcanda chinensis. Their structures were elucidated on the basis of comprehensive spectroscopic methods and electronic circular dichroism (ECD) calculations. Bioassay results showed that belamcanoxide B (1) exhibited moderated cytotoxic activities against HCT-116 and MCF-7 cell lines with IC50 values of 5.58 and 3.35 μM.
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