From quercetin during autoxidation of unsaturated lipid and radical reaction, a novel doubly-linked oxidative product was isolated and its structure has been characterized to be 1,3,11a-trihydroxy-9-(3,5,7-trihydroxy-4H-1-benzopyran-4-on-2-yl)-5a-(3,4-dihydroxyphenyl)-5,6,11-hexahydro-5,6,11-trioxanaphthacene-12-one by spectroscopic analyses and chemical transformation after optical resolution by chromatography.
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Hirose et al. (1999) studied this question.
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