Cytotoxic dimeric quinolone-terpene alkaloids from the root bark of Zanthoxylum rhetsa

Four quinolone-terpene alkaloids, chelerybulgarine (1), 2′-episimulanoquinoline (3), 2,11-didemethoxyvepridimerine B (4), and rhetsidimerine (5) were isolated from the root bark of Zanthoxylum rhetsa DC.