Acta Cryst. (2009). E65, o358-o359  [ doi:10.1107/S1600536809002050 ]

5-{[(3R,5aS,6R,8aS,9R,10S,12R,12aR)-3,6,9-Trimethylperhydro-3,12-epoxy-1,2-dioxepino[4,3-i]isochromen-10-yl]oxymethyl}benzene-1,3-diol

W. Gul, P. Carvalho, A. Galal, M. A. Avery and M. A. El Sohly

Abstract: The title compound, C₂₂H₃₀O₇, is a fused five-ring system that is of interest for its anticancer and antimalarial activity. The six-membered C₆ and C₅O rings display chair conformations. The six-membered C₃O₃ ring containing the ether and peroxy functionalities has a distorted boat conformation, with a C-O-O-C torsion angle of 42.6 (1)° for the peroxy group. The seven-membered C₆O ring has a distorted boat-type conformation, while the seven-membered C₅O₂ ring has a very distorted chair-type conformation. The structure contains intermolecular O-HO and O-H(O,O) bonds that link the molecules into sheets parallel to the (100) planes.

Online 23 January 2009

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