(3R,4aS,5R)-3-Hydro­xy-5-isopropenyl-3,8-di­methyl-4,4a,5,6-tetra­hydro-2(3H)-naphthalenone

In the crystal structure of C₁₅H₂₀O₂, mol­ecules are associated by intermolecular hydrogen bonds between the hydroxy function and a keto group [O⃛O 2.770 (2) Å], forming chains along the [100] direction in the crystal. Both six-membered rings in the decalin unit adopt envelope conformations; one section of the mol­ecule, encompassing the extended conjugation of a C=C double bond with an enone functionality [C=C—C=O = 175.6 (2)° and C=C—C=C = 176.6 (2)°], is flat, whilst the rest of the mol­ecule is folded relative to the constrained part. The stereochemistry was determined from the R-(–)-carvone starting material.