| Literature DB >> 8862035 |
J P Kim1, W G Kim, H Koshino, J Jung, I D Yoo.
Abstract
Three new sesquiterpene ortho-naphthoquinones, davidianones A, B and C, together with four known compounds, mansonones E, F, H and I, were isolated from the root bark of Ulmus davidiana. On the basis of spectral data including pulse field gradient two-dimensional NMR spectroscopy, the structures of new compounds were established as 3-hydroxymethyl-6,9-dimethylnaphtho(1,8-b,c)pyran-7,8-dione, 6-methoxycarbonyl-3,9-dimethylnaphtho(1,8-b,c)pyran-7,8-dione, 6-dimethoxymethyl-3,9-dimethylnaphtho(1.8-b,c)pyran-7,8-d ion e, respectively. Their antioxidative activities were evaluated by a thiobarbituric acid method using rat liver microsomes, with mansonone F showing the greatest activity.Entities:
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Year: 1996 PMID： 8862035 DOI： 10.1016/0031-9422(96)00279-8
Source DB: PubMed Journal: Phytochemistry ISSN： 0031-9422 Impact factor: 4.072