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A structure determination of C26H21N2O4 has shown that the molecule consists of two spiro junctions involving oxindole, acenaphthene and pyrrolidine ring systems. The least-squares plane through the pyrrolidine ring atoms is almost perpendicular to that through the acenaphthene ring atoms. The pyrrolidine ring adopts a half-chair conformation. In the crystal, molecules are stabilized by intramolecular C-H…O interactions.

Crystal Structure of Acenaphthene-1'-one-spiro[2'.3]-[4-ethoxycarbonyl]-1N-methyl-pyrrolidine-spiro[2.2"]oxindole