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The title compound, C 15 H 16 N 2 O 4 , was synthesized from a mixture of α-himachalene (2-methyl­ene-6,6,9-trimethyl­bicyclo­[5.4.O 1,7 ]undec-8-ene) and β-himachalene (2,6,6,9-tetra­methyl­bicyclo­[5.4.0 1,7 ]undeca-1,8-diene) which were isolated from an oil of the Atlas cedar ( Cedrus atlantica ). The asymmetric unit contains two independent mol­ecules. In each of the two mol­ecules, two O atoms of one nitro group are disordered over two sets of sites with site-occupancy factors of 0.636 (5):0.364 (5) and 0.832 (5):0.168 (5). The crystal structure features weak C—H⋯O hydrogen bonds.

1-Isopropyl-4,7-dimethyl-2,8-dinitronaphthalene