Erregistroa posta elektronikoz bidali: 4′-Methyl-1H-14′,19′-dioxa-4′-aza­spiro­[indole-3,5′-tetra­cyclo­[18.4.0.0(2,6).0(8,13)]tetra­cosa­ne]-1′(24′),8′,10′,12′,20′,22′-hexa­ene-2,7′(3H)-dione