title: Biphenyl-3,3'-dicarb-oxy-lic acid.
abstract: The asymmetric unit of the title compound, C(14)H(10)O(4), contains one half mol-ecule, the complete mol-ecule being generated by a twofold axis. The two benzene rings form a dihedral angle of 43.11 (5)°. Inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into one-dimensional zigzag chains. These chains are further connected into two-dimensional supra-molecular layers by weak π-π stacking inter-actions between neighbouring benzene rings, with centroid-centroid distances of 3.7648 (8) Å.
authors.affiliation: College of Mechanical and Materials Engineering, China Three Gorges University, Yichang, Hubei 443002, People's Republic of China.
authors.forename: Shao-Hua
authors.initials: SH
authors.lastname: Deng
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Yi-Qiang
authors.initials: YQ
authors.lastname: Mu
authors.forename: Cai
authors.initials: C
authors.lastname: Li
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Liu