1,2-Dimethyl-4-nitrobenzene 3,4-Dimethyl-1-nitrobenzene 4-Nitro-1,2-dimethylbenzene 4-Nitro-o-xylene 99-51-4 Benzene, 1,2-dimethyl-4-nitro- NSC66555 o-Xylene, 4-nitro- p-Nitro-o-xylene para-Nitro-ortho-xylene