title: 5-(Hy-droxy-meth-yl)furan-2-carb-oxy-lic acid.
abstract: In the title compound, C(6)H(6)O(4), the furan ring is nearly coplanar with the carboxyl group, the maximum atomic deviation being 0.0248 (9) Å. The crystal packing is stabilized by classical O-H⋯O and weak C-H⋯O hydrogen bonding.
authors.affiliation: Laboratory of Microbial Pharmaceutical Engineering, Xiamen University, Xiamen 361005, People's Republic of China.
authors.forename: Jun-Liang
authors.initials: JL
authors.lastname: Liu
authors.forename: Qing-Yan
authors.initials: QY
authors.lastname: Xu