Aristololactam alkaloids from the roots of Dasymaschalon rostratum .

A novel aristololactam alkaloid, dasymalactam A ( 1 ), together with nine known analogues ( 2-10 ), were isolated from the roots of Dasymaschalon rostratum . Their structures were elucidated by IR, NMR and MS spectrums and comparisons with data reported in the literature. All compounds demonstrated weak cytotoxicity against Hela, MCF-7, A-549, MGC-803, and COLO-205 human cancer cell lines.