1,4,4-Tri­methyl-9-phenyl-8-oxa-9-aza­bi­cyclo­[3.2.2]­non-6-en-2-one

The structure of the adduct of eucarvone with nitro­so­benzene, C₁₆H₁₉NO₂, is reported. The [3.2.2] bicyclic system corresponds to two seven-membered rings in boat and distorted chair conformations and a six-membered ring that adopts a distorted boat conformation. No conjugation is observed between the phenyl group and the N—O system. The packing is directed mainly by a C⋯O hydrogen bond, C—H⋯O-(1 − x, −y, z) and by intermolecular C—H⋯π interactions.