Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 10 (October 2003)

Acta Cryst. (2003). C59, o593-o595 [doi:10.1107/S010827010301864X]

Dibothrioclinin I and II, epimers from Gerbera piloselloides (L.) Cass

C. Wang, Q.-T. Zheng, Y. Lu, Y. Xiao, J.-B. Li and Y. Ding

Abstract: Dibothrioclinin I and II, namely (+)-(11R,12S,25R,27S)- and (±)-(11RS,12RS,25RS,27SR)-3,3,7,17,21-pentamethyl-4,12,18,26-tetraoxaheptacyclo[15.11.1.0^2,15.0^5,14.0^6,11.0^19,28.0^20,25]nonacosa-5(14),6,8,10,19(28),20,22,24-octaene-13,27-dione, respectively, are C₃₀H₂₈O₆ epimers which are derived from two bothrioclinin moieties joined so as to create an additional six-membered ring. Structurally, the epimers differ only by inversion at one C atom of a central ring junction and the corresponding six-membered rings have similar conformations in each molecule, except for one ring adjacent to this inversion site.

Formula: Two C₃₀H₂₈O₆ epimers

Online 23 September 2003


	Structure factor file (CIF format) (133.8 kbytes) Contains datablock I

	Structure factor file (CIF format) (253.9 kbytes) Contains datablock II

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