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The crystal structure of  syn -2-hydroxy, 2-carboxyl[4.4.1]propellane-6-ene has been determined at 293 K and 150 K, with the latter results preferred because disorder in the molecule is less pronounced than at 293 K. The two molecules (A, B) in the asymmetric unit (space group  C 2/ c ,  Z  = 16) are conformers with differences in the location of the carboxyl groups and hydroxyl hydrogens and the conformations of the cyclohexene rings. Chains of A and B molecules are linked by hydrogen bonds in hydroxyl 4-rings, and in two independent A–A and B–B carboxylic acid dimers. The 4-rings are centrosymmetric and homodromic, while the carboxyl dimers, appreciably distorted from planarity in somewhat different ways, have crystallographic two fold axes normal to their mean planes.

syn -2-Hydroxy, 2-carboxyl[4.4.1]propellane-6-ene