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In the title compound, C 13 H 15 NO 4 S, there are two independent but conformationally similar mol­ecules in the asymmetric unit, both having an  E  conformation of the side-chain C=C group. Intra­molecular N—H⋯O and O—H⋯O hydrogen-bonding inter­actions are present in both molecules. In the crystal, one of the mol­ecule types is linked through inter­molecular hy­droxy–ketone O—H⋯O inter­actions, forming one-dimensional chains extending along [010], whereas the other mol­ecule type shows no associations.

Ethyl (E)-3-hydroxy-2-{N-[2-(thiophen-2-yl)ethenyl]carbamoyl}but-2-enoate