The photoreaction of the antioxidant ellagic acid (EA) elicits a drastic coloration in solution from colorless to yellow in aerated tetrahydrofuran, which appears as a new absorption band at 405 nm. Analysis of the X-ray crystal structure suggests that the photo-oxidation product of EA is a multiple cleavage π-structure (Ox-EA) that results from the interaction of EA with singlet oxygen followed by sequential cleavage and rearrangement steps.

中文翻译：

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溶液中鞣花酸光氧化产物的分子结构

抗氧化剂鞣花酸（EA）的光反应在充气的四氢呋喃中引起溶液从无色到黄色的剧烈着色，在405 nm处显示为新的吸收带。对X射线晶体结构的分析表明，EA的光氧化产物是多重裂解的π结构（Ox-EA），其由EA与单线态氧的相互作用，随后的顺序裂解和重排步骤产生。