Narayanan, S., Srinivasan, T., Purushothaman, S., Raghunathan, R., & Velmurugan, D. (2012). 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. International Union of Crystallography.

Narayanan, Sibi, Thothadri Srinivasan, Santhanagopalan Purushothaman, Raghavachary Raghunathan, e Devadasan Velmurugan. 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. International Union of Crystallography, 2012.

Narayanan, Sibi, et al. 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. International Union of Crystallography, 2012.