The whole plant of Corydalis bungeana (Papaveraceae) yielded several flavonol O-glycosides together with two isoquinolinone alkaloids. Two flavonol O-glycosides identified as the 3-O-α-arabinopyranosyl(1′ † 6″)-β-glucopyranoside 7-O-β-glucopyranosides of kaempferol and quercetin were isolated from the whole plant of Corydalis bungeana Turcz. together with eight known flavonol O-glycosides. Two isoquinolinone alkaloids were also obtained from the same source, including the new derivative, 6,7-methylenedioxy-2-(6-acetyl-2,3-methylenedioxybenzyl)-1(2H)-isoquinolinone. The structures were determined by spectroscopic methods (NMR and high-resolution MS). © 2004 Elsevier Ltd. All rights reserved.