(2E)-4-(1,3-Benzodioxol-5-ylamino)-4-oxobut-2-enoic acid;2-butenoic acid, 4-(1,3-benzodioxol-5-ylamino)-4-oxo-, (2E)-;4-(1,3-benzodioxol-5-ylamino)-4-oxobut-2-enoic acid
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