2-butenoic acid, 2-hydroxy-4-oxo-4-(2-thienyl)-, methyl ester, (2Z)-;Methyl (2Z)-2-hydroxy-4-oxo-4-(2-thienyl)but-2-enoate;methyl (2Z)-2-hydroxy-4-oxo-4-thien-2-ylbut-2-enoate
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