3-(3,4-Dioxo-1,5-cyclohexadien-1-yl)propenoic acid;3,4-Dioxo-1,5-cyclohexadiene-1-acrylic acid;4-(2-Carboxyvinyl)-1,2-benzoquinone;Caffeoquinone;2-Propenoic acid, 3-(3,4-dioxo-1,5-cyclohexadien-1-yl)-
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