| Summary: | In the title compound, C24H29ClO8·2.5H2O, which contains two organic molecules (A and B) and five heavily disordered water molecules in the asymmetric unit, the γ-lactone ring and the cyclohexenone ring are both trans-fused to the central cyclodecene ring. The cyclehexenone ring features an α,β-unsaturated ketone with torsion angles between the conjugated carbonyl and alkene bonds of 0.6 (3) and 7.4 (4)° for molecules A and B, respectively. The ptilosarcenone torsion angles between conjugated alkene bonds are 56.2 (5) and 55.4 (6)° for A and B, respectively. In the crystal, the components are linked by O—H...O hydrogen bonds. The absolute configuration of ptilosarcenone was determined unambiguously and exhibits similar absolute stereochemistry to that found in the crystal structures of other octocoralline briaranes.
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