Triethylammonium 8-acetyl-3-methyl-9-phenyl-7-oxo-2-azaspiro[4.5]dec-2-ene-4-nitronate

The acinitro group in the title compound, C6H16N+.C17H17N2O5, is almost coplanar with the isoxazoline ring, which assumes a flattened envelope conformation. The cyclohexanone ring adopts a half-chair conformation and carries a perpendicular [83.54 (10)degrees] phenyl ring and a bent [64.30 (17)degrees] acetyl group. The triethylammonium residue forms a hydrogen bond with the nitronate moiety. Intermolecular interaction is exerted through a hydrogen bond between the acidic H atom of the cyclohexanone ring and the N atom of the isoxazoline ring.