Acta Cryst. (2002). E58, o871-o873  [ doi:10.1107/S1600536802011832 ]

The pseudoguaianolide peruvin

F. R. Fronczek

Abstract: The title compound, (3aR,4aS,7aR,8S,9aR)-decahydro-7a-hydroxy-4a,8-dimethyl-3-methyleneazuleno[6,5-b]furan-2,5-dione, C₁₅H₂₀O₄, from Ambrosia artemisiifolia, has its seven-membered ring in a twist conformation. Molecules form intermolecular OO hydrogen bonds of length 2.920 (2) Å.

Online 19 July 2002

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