rac -(2a S ,2a 1 R ,3a R ,3a 1 S ,5a S ,6a R )-2a-Allyl-2,4-di-chloro-2a,2a 1 ,3a 1 ,5a,6,6a-hexa-hydro-3a H -3-oxadi-cyclo-penta-[ cd , gh ]penta-len-3a-ol.

The title racemic triquinane, C 14 H 14 Cl 2 O 2 , is composed of four five-membered rings, one of which is a tetra-hydro-furan ring to which an allyl group on one side and a hydroxyl group on the other side are attached. The core of the triquinane unit has a cis-syn-cis configuration. In the crystal, the mol-ecules are linked by pairwise O-H⋯O hydrogen bonds, generating inversion dimers featuring R 2 2 (8) loops.