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In the title compound, C(18)H(20)N(2)O(5), the pyrrolidine ring adopts an envelope conformation with the C atom bonded to the methyl groups as the flap. The dihydro-isoxazole ring is essentially planar (r.m.s. deviation = 0.041 Å) and forms a dihedral angle of 65.19 (6)° with the phenyl ring. In the crystal, neighbouring mol-ecules are linked into chains along [110] by inter-molecular C-H⋯O hydrogen bonds and weak C-H⋯π inter-actions involving the phenyl ring.

(5R)-Ethyl 6-benzyl-8,8-dimethyl-7,9-dioxo-1-oxa-2,6-diazaspiro[4.4]non-2-ene-3-carboxylate