Acta Cryst. (2009). E65, o221  [ doi:10.1107/S1600536808043481 ]

Preaustinoid A: a meroterpene produced by Penicillium sp.

S. H. Maganhi, T. P. Fill, E. Rodrigues-Fo, I. Caracelli and J. Zukerman-Schpector

Abstract: The title meroterpene preaustinoid A (systematic name: methyl 15-hydroxy-2,6,6,10,13,15-hexamethyl-17-methylene-7,14,16-trioxotetracyclo[11.3.1.0^2,11.0^5,10]heptadecane-1-carboxylate), C₂₆H₃₆O₆, features a fused four-ring arrangement. Three rings are in different distorted chair conformations and the other is in a distorted boat conformation. The absolute configuration was established based on [_D] = -4.97° (c = 1.10 g l^-1, CH₂Cl₂). In the crystal, the molecules are connected into supramolecular chains via O-HO hydrogen bonds.

Online 8 January 2009

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