Studies on quality standards of Radix Angelicae dahuricae Determination of four coumarin constituents before and after Angelicae Dahuricae Radix stewed with yellow rice wine and research on its mutual transformation mechanism Chemical constituents from ethyl acetate soluble parts in roots of Angelica dahurica var. formosana Effect of furan coumarins from Angelica Dahuricae Radix on intestinal transport absorption of puerarin, paeoniflorin, and vincristine Chemical constituents from polarity part in roots of Angelica dahurica var. formosana cv.Chuanbaizhi Chemical constituents from lipophilic parts in roots of Angelica dahurica var. formosana cv.Chuanbaizhi In vitro study on affinity of coumarins in Angelicae Dahuricae Radix and P-gp