Acta Cryst. (2005). E61, o687-o689  [ doi:10.1107/S1600536805004617 ]

A stereoisomer of bharangin triacetate

K. Ravikumar, B. Sridhar and M. Marthanda Murthy

Abstract: A stereoisomer of bharangin triacetate [systematic name: 6,10-bis(acetyloxy)-8-isopropyl-4,4,11a-trimethyl-2-oxo-2,3,4,6,11,11a-hexahydrobenzo[5,6]cyclohepta[1,2-b]pyran-9-yl acetate], C₂₆H₃₂O₈, a tricyclic diterpenoid, is reported. There is a 0.56  (3):0.44  (3) disorder in the terminal isopropyl side chain. The title compound and a previously reported stereoisomer, crystallizing in the same space group, exhibit very similar molecular conformations, but differ in the orientation of one of the acetate groups, resulting in a different configuration at the atom to which the acetate group is attached. Consequently, different C-HO interactions are observed.

Online 19 February 2005

Copyright © International Union of Crystallography
IUCr Webmaster