Abstract
Three new compounds designated as firmianones A, B, and C (1-3), along with 13 known compounds, were isolated from the roots of Firmiana platanifolia. Their structures were elucidated by interpretation of HRESIMS, 1H-1H COSY, HMQC, HMBC, and NOESY. The absolute configurations of firmianones A and B with a rare hexacyclic skeleton were determined by CD exciton-coupling experiments. Firmianones A and B exhibited moderate cytotoxicity to the P388 cancer cell line.
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