4′-Methyl-1<i>H</i>-14′,19′-dioxa-4′-azaspiro[indole-3,5′-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′(3<i>H</i>)-dione
Acta crystallographica. Section E