title: 2-Hydr-oxy-6,6-dimethyl-bicyclo-[3.1.1]heptane-2-carboxylic acid.
abstract: The title compound, C(10)H(16)O(3), with a bicyclo-[3.1.1]heptane unit, was obtained by oxidation of β-pinene. The asymmetric unit contains two independent mol-ecules with similar geometry: the six-membered rings in both mol-ecules adopt envelope conformations. In the crystal, the independent mol-ecules exist as O-H⋯O hydrogen-bonded dimers. The dimers are linked into helical chains along the b axis by O-H⋯O hydrogen bonds.
authors.affiliation: Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, People's Republic of China.
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Gao
authors.forename: Shi-Bin
authors.initials: SB
authors.lastname: Shang
authors.forename: Xu
authors.initials: X
authors.lastname: Xu
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Rao
authors.forename: Hong-Xiao
authors.initials: HX
authors.lastname: Wang