Two new prenylflavanones named sigmone and sigmotriol have been isolated from the stem bark of Erythrina sigmoidea along with two known constituents 8-(3″-methylbut-2″-enyl)-7,3′,4′-trihydroxyflavanone and 7,3′,4′-trihydroxyflavanone. Their structures were elucidated by spectroscopic methods.
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