Dieth­yl 6,9-dibromo-1,4-dioxo-1,2,3,4,5,10-hexa­hydro-2,3,4a,10a-tetra­aza­benzo[g]cyclo­penta­[cd]azulene-2a,10b-dicarboxyl­ate

The title compound, C₁₈H₁₈Br₂N₄O₆, is an important inter­mediate for the synthesis of mol­ecular clips. Inter­molecular N—H...O hydrogen bonds form eight-membered rings. No π–π stacking is observed.