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For the first time the structural determination of the biflavonoid, 4-H-2,3-dihydro-1-benzopyran-4-one-6-[2-phenyl-8-(3-methyl-2-butenyl)-5,7-dimethoxy-2-H-3,4-dihydro-1-benzopiran-4-yl)-5,7-dihydroxy-8-(3-methyl-2-butenyl)-2-phenyl, named toxicarine ( 1 ) is presented, joined the isolation of the flavanone 7-O-methylglabranine ( 2 ) and a mixture of the rotenoids tephrosin ( 3 ) and rotenolone ( 4 ) from the roots of Tephrosia toxicaria (Sw.) Pers. Their structures were established by spectroscopic methods, meanly spectral data obtained by analysis of 1 H and 13 C NMR (1D and 2D) spectra.

Biflavonoid toxicarine, rotenoids and a flavanone from the roots of Tephrosia toxicaria