4′-Methyl-14′,19′-dioxa-4′-azaspiro[acenaphthylene-1,5′-tetracyclo[18.4.0.0<sup>2,6</sup>.0<sup>8,13</sup>]tetracosane]-1′(24′),8′,10′,12′,20′,22′-hexaene-2,7′(1<i>H</i>)-dione
Acta crystallographica. Section E