rel-(11bR,11cS)-Diethyl 5,10-dihydro-7-nitro-4,11-dioxo-1H,3H,4H,11H-2-oxa- 3a,4a,10a,11a-tetra­azabenz[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxyl­ate

In the title compound, C₂₀H₂₁N₅O₉, the dihedral angle between the two five-membered rings of the glycoluril system is 68.79 (14)° and the crystal structure is stabilized by inter­molecular C—H...O inter­actions.

2,3-Bis(bromo­meth­yl)-1-meth­oxy-4-nitro­benzene

In the title compound, C₉H₉Br₂NO₃, the mol­ecules are linked by inter­molecular C—H...O hydrogen bonds.