title: 1,4a,7-Trimethyl-7-vinyl-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodeca-hydro-phenanthrene-1-carboxylic acid.
abstract: The title compound, pimaric acid, C(20)H(30)O(2), was isolated from a mixture of resin acids. There are three rings in the structure. The two cyclo-hexane rings have classical chair conformations with trans-fused ring junctions. The cyclo-hexene ring appears as a semi-chair.
authors.affiliation: Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, 210042, People's Republic of China.
authors.forename: Yu-Xiang
authors.initials: YX
authors.lastname: Chen
authors.forename: Zhen-Dong
authors.initials: ZD
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Gu
authors.forename: Yu-Min
authors.initials: YM
authors.lastname: Wang