title: 2-(4-Ethoxy-benzyl-idene)butanoic acid.
abstract: In the crystal structure of the title compound, C(13)H(16)O(3), dimers are formed due to inter-molecular O-H⋯O hydrogen bonding. There exists an intra-molecular C-H⋯O hydrogen bond which forms a five-membered ring. There is also present a C-H⋯π inter-action between a methyl CH group of an ethyl group and the centroid of the aromatic ring.
authors.forename: Niaz
authors.initials: N
authors.lastname: Muhammad
authors.forename: M Nawaz
authors.initials: MN
authors.lastname: Tahir
authors.lastname: Zia-Ur-Rehman
authors.forename: Saqib
authors.initials: S
authors.lastname: Ali