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In the title compound, C 33 H 29 NO 4 , the acenaphthyl­ene ring system is essentially planar (r.m.s. deviation = 0.0290 Å). The pyrrolidine ring adopts a C-envelope conformation with a C atom displaced by 0.671 (2) Å from the mean-plane formed by the remaining ring atoms. The pyrrolidine ring is fused to acenaphthyl­ene ring system making a dihedral angle of 88.0 (7)°. In the crystal, mol­ecules are linked into  R   2   2 (9) dimers  via  C—H⋯N and C—H⋯O hydrogen bonds. Two C atoms act as donors to the same O atom acceptor, resulting in the formation of  R   2   1 (7) ring motifs. These two motifs combine to form hydrogen-bonded sheets running along the  a-  and  b -axis directions.

acta crystallographica. section e

4′-Methyl-14′,19′-dioxa-4′-azaspiro[acenaphthylene-1,5′-tetracyclo[18.4.0.02,6.08,13]tetracosane]-1′(24′),8′,10′,12′,20′,22′-hexaene-2,7′(1H)-dione