The structures of eumitrins A1, A2 and B: The yellow pigments of the lichen,Usnea bayleyi(Stirt.)Zahlbr. |
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| Authors: | Dun-Mei Yang N Takeda Y Iitaka V Sankawa S Shibata |
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| Institution: | Faculty of Pharmaceutical Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo Japan |
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| Abstract: | The yellow pigments named eumitrins A1, A2 and B were isolated from the lichen, Usnea bayleyi(Stirt.)Zahlbr. The modified bixanthone structures of these compounds were deduced mainly from their spectral data, and their absolute structures (2a, 3a and 4a) were established on the basis of X-ray crystallographic analysis of a transformed product (6) of tribromo-eumitrin B (5). |
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| Keywords: | The author to whom inquiries should be addressed |
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