title: Three new Diels-Alder type adducts from the stem bark of Morus cathayana.
abstract: Three new Diels-Alder type adducts cathayanons C (1), D (2), and E (3), together with one known compound sanggenon C (4), were isolated from the stem bark of Morus cathayana. Their structures were fully elucidated by spectroscopic and chemical methods. Compound 2 showed good anti-oxidation activity with the inhibitory rate of malondialdehyde being 88% at a concentration of 10(- 6) mol/l.
authors.affiliation: The Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Peking Union Medical College, Ministry of Education, Beijing, China.
authors.forename: Qing-Jian
authors.initials: QJ
authors.lastname: Zhang
authors.forename: Gang
authors.initials: G
authors.lastname: Ni
authors.forename: Ying-Hong
authors.initials: YH
authors.lastname: Wang
authors.forename: Ruo-Yun
authors.initials: RY
authors.lastname: Chen
authors.forename: De-Quan
authors.initials: DQ
authors.lastname: Yu
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001572:Benzofurans / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002867:Chromones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D015394:Molecular Structure; D031625:Morus / Q000737:chemistry*; D019906:Nuclear Magnetic Resonance, Biomolecular; D024301:Plant Bark / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D014810:Vitamin E / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D001572:Benzofurans; D002867:Chromones; D004365:Drugs, Chinese Herbal; D005419:Flavonoids; C540775:cathayanon C; C540774:cathayanon D; D014810:Vitamin E; C477157:sanggenone C