Mechanisms of the vasorelaxant effect of 1,5-dihydroxy-2,3-dimethoxy-xanthone, an active metabolite of 1-hydroxy-2,3,5-trimethoxy-xanthone isolated from a Tibetan herb, Halenia elliptica, on rat coronary artery - Wang, Y; Shi, J G; Wang, M Z; Che, C T; Yeung, J H (Life Sci, 2008)