Abstract
Vernoramyosides A-F (1–6), six new Δ7,9(11) stigmastane-type steroid saponins, along with four known analogues (7–10) were isolated from the leaves of Vernonia amygdalina Delile (Compositae). Their structures were determined by the combination of NMR, ECD and HR-ESI-MS data. These compounds all possessed highly oxidized side chain and a γ-lactam or α,β-unsaturated five-membered lactone ring. All isolates were screened for their activities in reversing resistance in MCF/DOX cells.
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