Abstract
Four new fluorenone alkaloids, caulophylline A-D ( 1– 4), and one new dihydroazafluoranthene alkaloid, caulophylline E ( 5) were isolated from the roots of Caulophyllum robustum Maxim. Their structures were elucidated by spectroscopic analysis. Among the isolated alkaloids, Caulophylline E showed good scavenging effects against DPPH radical with IC 50 of 39 μM.
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