title: 7-Isopropyl-1,4a-dimethyl-1,2,3,4,4a,5,6,7,8,9,10,10a-dodeca-hydro-phenan-threne-1-carboxylic acid.
abstract: The title compound, C(20)H(32)O(2), has been isolated from hydrogenated rosin. There are two independent mol-ecules in the asymmetric unit. In each mol-ecule, the cyclo-hexane ring assumes a chair conformation, while the two cyclo-hexene rings adopt half-chair and envelope conformations. Inter-molecular O-H⋯O hydrogen bonding between carboxyl groups links pairs of independent mol-ecules into dimers.
authors.affiliation: Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, People's Republic of China.
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Rao
authors.forename: Zhan-Qian
authors.initials: ZQ
authors.lastname: Song
authors.forename: Shi-Bin
authors.initials: SB
authors.lastname: Shang
authors.forename: Yong
authors.initials: Y
authors.lastname: Wu