In the title compound, C(13)H(12)N(2)O(4), the almost planar (r.m.s. deviation = 0.012 Å) dioxoindolinyl unit and the envelope-shaped oxazolidine ring (with the methyl-ene C atom bonded to the N atom as the flap) are linked by a -CH(2)-CH(2)- bridge, in which the N-C-C-N unit adopts a gauche conformation [torsion angle = 62.7 (2)°].
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