Journal
ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE
Volume 66, Issue -, Pages O1531-U223Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600536810019483
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Funding
- Office of the Higher Education Commission, Thailand
- 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endowment Fund)
- Department of Chemistry, Faculty of Science, Chulalongkorn University
- National Center of Excellence for Petroleum, Petrochemicals, and Advanced materials
- Faculty of Science [A1B1]
- Thai Government Stimulus Package 2 [TKK2555]
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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-dodecahydrophenanthrene-1-carboxylic acid], C20H30O2, is a pimarane-type diterpene extracted from Croton oblongifolius. There are two independent molecules 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 molecules in the asymmetric unit form O-H center dot center dot center dot O hydrogen-bonded R-2(2)(8) dimers. The absolute configuration was assigned on the basis of the published literature on analogous structures.
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