Diels-Alder type adducts in stem bark of Morus mongolica / 中草药

Objective To study the Diels-Alder type adducts in the stem bark of Morus mongolica.Methods The compounds were isolated and purified by silic gel column chromatography,RP18 and Sephadex LH-20.The structures were identified by various spectral evidence.Results Six Diels-Alder type adducts were obtained and they were albanin F(Ⅰ),kuwanon L(Ⅱ),dimoracin(Ⅲ),kuwanon J(Ⅳ),mulberrofuran J(Ⅴ),mulberrofuran Q(Ⅵ).Conclusion Compounds Ⅱ,Ⅲ,and Ⅴ are isolated from the plant for the first time and compounds ⅣⅥ show the anti-oxidation activities.