The crystal structure of the title compound, (+)-10,13-dioxo-2α,4aβ,6aα,6bβ,9,9,12aβ-heptamethyl- 1,2,3,4,4a,-5,6,6a,6b,7,8,8aα,9,10,11,12,12a,12bα,13,14bβ- icosa-hydropicene-2β-carboxylic acid, C30H44O4, involves carboxyl-to-ketone hydrogen-bonding catemers. Distorted hydrogen bonds progress from the carboxyl H atom of one molecule to the remote-ring ketone O atom of a screw-related neighbor [O⋯O = 2.975 (5) Å], yielding helical hydrogen-bonding chains which proceed in the b direction. Two C - H⋯O close contacts were found, connecting the unsaturated ketone (2.71 Å) and the acid carbonyl (2.55 Å) to separate screw-related neighbors.
|Original language||English (US)|
|Number of pages||4|
|Journal||Acta Crystallographica Section C: Crystal Structure Communications|
|State||Published - Nov 15 1999|
All Science Journal Classification (ASJC) codes
- Biochemistry, Genetics and Molecular Biology(all)