Suwancharoen Sunisa, Tommeurd Wantanee, Phurat Chuttree, Muangsin Nongnuj, Pornpakakul Surachai
Research Centre of Bioorganic Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Acta Crystallogr Sect E Struct Rep Online. 2010 Jun 5;66(Pt 7):o1531. doi: 10.1107/S1600536810019483.
THE TITLE COMPOUND [SYSTEMATIC NAME: (1R,4aR,7S,8aS,10aS)-1,4a,7-trimethyl-7-vinyl-1,2,3,4,4a,6,7,8,8a,9,10,10a-dodeca-hydro-phenanthrene-1-carb-oxy-lic acid], C(20)H(30)O(2), is a pimarane-type diterpene extracted from Croton oblongifolius. There are two independent mol-ecules in the asymmetric unit. In both of these, the six-membered rings A, B and C adopt chair, boat and half-chair conformations, respectively. Rings A and B are trans-fused. The two mol-ecules in the asymmetric unit form O-H⋯O hydrogen-bonded R(2) (2)(8) dimers. The absolute configuration was assigned on the basis of the published literature on analogous structures.
标题化合物[系统名称：(1R,4aR,7S,8aS,10aS)-1,4a,7-三甲基-7-乙烯基-1,2,3,4,4a,6,7,8,8a,9,10,10a-十二氢菲-1-羧酸]，C(20)H(30)O(2)，是一种从长圆叶巴豆中提取的海松烷型二萜。不对称单元中有两个独立分子。在这两个分子中，六元环A、B和C分别采取椅式、船式和半椅式构象。环A和B是反式稠合的。不对称单元中的两个分子形成O-H⋯O氢键连接的R(2)(2)(8)二聚体。绝对构型是根据已发表的关于类似结构的文献确定的。
