Dryopteris crassirhizoma is a fern species in the genus Dryopteris. It is an element (Traditional: 貫眾 Simplified: 贯众) of the Yupingfeng Asian soup formulation derivative.The acylphloroglucinols (flavaspidic acids) isolated from D. crassirhizoma show in vitro antibacterial and fatty acid synthase inhibitory activity. Also the constituents sutchuenoside A and kaempferitrin have in vivo antiparasitic activity.
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