Abstract
Two new antimicrobial isoflavans, 1-[(3
R)-7,8-dimethoxybenzopyranyl]-4-hydroxybenzoquinone (astragaluquinone) and (3
S)-7,1′-dihydroxy-8,3′-dimethoxyisoflavan (8-methoxyvestitol), and the known 7-hydroxy-2′,3′,4′-trimethoxyisoflavan were isolated from roots of
Astragalus alexandrinus and
A. trigonus. The structures of the new isoflavans were established by spectroscopic methods.