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organic compounds
The crystal structures of (4aα,8α,8aα)-(±)-1-oxoperhydro-8-hydroxy-naphthyl p-bromobenzoate, C17H19BrO3, (2), and (±)-endo-5-hydroxy-1-methylbicyclo[4.3.1.]decan-7-one, C11H18O2, (3), were determined to ascertain their relative configurations. Compound (2) has two cis-fused six-membered rings and both adopt chair conformations. Compound (3) has a bridged bicyclic ring system consisting of a six- and a seven-membered ring which both adopt chair conformations. Molecules of (3) are linked about inversion centres into dimers by O-HO hydrogen bonds [OO 2.844 (3) Å] involving the hydroxy and carbonyl groups.