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In the title compound, C 13 H 17 NO 3 ·0.5H 2 O, a new caffeic acid amide derivative, the solvent water mol­ecule lies on a twofold axis and the terminal ethyl group appears disordered with occupancy factors of 0.525 (6) and 0.475 (6). The benzene ring makes an angle of 17.3 (2)° with the C=C—C—O linker. The presence of an ethyl­enic spacer in the caffeic acid amide mol­ecule allows the formation of a conjugated system, strongly stabilized through π-electron delocalization. The C=C double bond in the linker is  trans , similar to those previously reported in caffeic esters. The crystal is stabilized by O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds. The mol­ecules of the caffeic acid amide form a supermolecular planar structure through O—H⋯O hydrogen bonds between a hy­droxy group of one caffeic acid mol­ecule and a carbonyl O atom of another. These planes inter­act  via  C—H⋯O, O—H⋯O and N—H⋯O hydrogen bonds to form a three-dimensional network.

(E)-N-Butyl-3-(3,4-dihydroxyphenyl)acrylamide hemihydrate