Isoflavans and a pterocarpan from Astragalus mongholicus

Three new isoflavans, 7-O-methylisomucronulatol, isomucronulatol 7,2′-di-O-glucoside, 5′-hydroxyisomucronulatol 2′,5′-di-O-glucoside, and one new pterocarpan, 3,9-di-O-methylnissolin were isolated from Astragalus mongholicus roots. Their structures were established by spectral analyses and chemical conversions.