title: 4-[(4-Acetyl-phen-yl)amino]-2-methyl-idene-4-oxo-butanoic acid.
abstract: In the title compound, C13H13NO4, the N-C(=O) bond length of 1.354 (2) Å is indicative of amide-type resonance. The dihedral angle between the mean planes of the benzene ring and oxo-amine group is 36.4 (3)°, while the mean plane of the 2-methyl-idene group is inclined by 84.2 (01)° from that of the oxo-amine group. In the crystal, classical O-H⋯O hydrogen bonds formed by the carb-oxy-lic acid groups and weak N-H⋯O weak inter-actions formed by the amide groups and supported by weak C-H⋯O inter-actions between the 2-methyl-idene, phenyl and acetyl groups with the carb-oxy-lic acid, oxo-amine and acetyl O atoms, together link the mol-ecules into dimeric chains along [010]. The O-H⋯O hydrogen bonds form R 2 (2)(8) graph-set motifs.
authors.affiliation: Department of Studies in Chemistry, Mangalore University, Mangaloagangotri 574 199, India.
authors.forename: B
authors.initials: B
authors.lastname: Narayana
authors.affiliation: Department of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India.
authors.forename: Prakash S
authors.initials: PS
authors.lastname: Nayak
authors.affiliation: Department of Studies in Chemistry, Industrial Chemistry Section, Mangalore University, Mangalagangotri 574 199, India.
authors.forename: Balladka K
authors.initials: BK
authors.lastname: Sarojini
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Jerry P
authors.initials: JP
authors.lastname: Jasinski