title: beta-Galactosidase-inhibiting new isoflavonoids produced by actinomycetes.
abstract: Six isoflavonoids having beta-galactosidase inhibiting activity were isolated from the culture filtrate of Streptomyces xanthophaeus. Their structures were determined by spectral analyses to be daidzein, daidzein 7-alpha-L-rhamnoside, daidzein 4',7-di-alpha-L-rhamnoside, genistein, genistein 7-alpha-L-rhamnoside and genistein 4',7-di-alpha-L-rhamnoside.
mesh_terms: D000192:Actinomycetales / Q000378:metabolism*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D005285:Fermentation; D005419:Flavonoids / Q000494:pharmacology*; D005696:Galactosidases / Q000037:antagonists & inhibitors*; D007529:Isoflavones / Q000032:analysis / Q000378:metabolism / Q000494:pharmacology*; D001616:beta-Galactosidase / Q000037:antagonists & inhibitors*
chemical_list: D005419:Flavonoids; D007529:Isoflavones; D005696:Galactosidases; D001616:beta-Galactosidase