Abstract
The organic extract of the heartwood of Acer nikoense Maxim. (Aceraceae) showed vasorelaxant activity on rat aorta with or without endothelium. Coumarin [scopoletin (1)] and coumarinolignans [cleomiscosin A (2) and aquillochin (3)] were isolated as major constituents from the organic extract of the heartwood of A. nikoense. Compounds 1-3 exhibited moderate vasorelaxant effects on rat aorta, while 2 and 3 showed vasorelaxant effects in the norepinephrine-stimulated and also in high K+-depolarized preparations.
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