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In the title compound, C16H17NO5, the six-membered N-containing ring has a half-boat form; the spiro C atom deviates by 0.34 (2) Å from the plane (r.m.s. deviation = 0.051 Å) defined by the N and four aromatic C atoms. Intramolecular N—H...O hydrogen bonding generates an S(6) ring motif and the dihedral angle between the mean plane though the S(6) ring and that through the five-atom half-boat plane is 3.39 (2)°. In the crystal, weak intermolecular C—H...O hydrogen bonds link molecules into zigzag chains along [001] due to c-glide symmetry, and C—H...π interactions extend along [010].