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

Abstract

In the title compound, C13H15NO4S, 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.