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The title compound, C 16 H 19 NO 5 , which was synthesized from  p -meth­oxy­cinnamic acid, has intra­molecular O—H⋯O and N—H⋯O hydrogen-bonding inter­actions. In the crystal, mol­ecules are linked by weak C—H⋯O hydrogen bonds and aromatic π–π stacking inter­actions [minimum ring centroid–centroid separation = 3.790 (1) Å].

Ethyl (E)-3-hydroxy-2-[(4-methoxystyryl)carbamoyl]but-2-enoate