1,4-Bis(4-methyl-2-nitro­phen­oxy)butane

The asymmetric unit of the title compound, C18H20N2O6, contains one-half mol­ecule, the mid-point of the central C—C bond being located on a crystallographic inversion centre. In the crystal, weak C—H⋯O inter­actions generate a layered structure. The O atoms of the nitro group are disordered over two sets of sites with a refined occupancy ratio of 0.700 (8):0.300 (8).