Diethyl 2-tert-butyl-4,11-dioxo-2,3-di-hydro-cis-1H,5H,10H-2,3a,4a,10a,11a-penta-azabenzo[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxyl-ate.

In the title mol­ecule, C24H31N5O6, the two ethyl fragments are each disordered over two conformations [occupancy ratios 0.58 (13)/0.42 (13) and 0.56 (12)/0.44 (12)]. The crystal packing exhibits inter­molecular non-classical C—H⋯O hydrogen bonds and π–π inter­actions between benzene rings [centroid–centroid distances = 3.836 (5) A].