Abstract
The heartwood of Machaerium opacum contains 2,3-dimethoxyphenol, the stilbenes pinosylvin monomethyl ether and dimethyl ether, and the isoflavans (−)-duartin and (−)-mucronulatol. The structure of (3 S)-7,3′-dihydroxy-8,2′,4′-trimethoxyisoflavan was deduced for duartin and the constitution confirmed by synthesis of the racemate.
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