title: 3-Methyl-4-oxo-2-phenyl-4H-chromene-8-carboxylic acid.
abstract: In the title compound, C(17)H(12)O(4), the chromene unit is approximately planar, the maximum deviation from the mean plane being 0.0166 Å. The attached phenyl ring makes a dihedral angle of 53.2 (1)° with the fused ring system. The packing of the mol-ecules in the crystal structure is governed by C-H⋯O and O-H⋯O hydrogen-bonding inter-actions.
authors.affiliation: School of Pharmaceutical and Chemical Engineering, Taizhou University, Linhai 317000, People's Republic of China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Hong
authors.forename: Hua-Jiang
authors.initials: HJ
authors.lastname: Jiang
authors.forename: Yu-Guo
authors.initials: YG
authors.lastname: Zhuang
authors.forename: Hai-Chang
authors.initials: HC
authors.lastname: Guo