a functional group consisting of a nitrogen atom bonded to an oxygen atom with a double bond and a single bond, often denoted as -NO2.
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1-Methoxy-2-(2-{2-[2-(2-methoxy-ethoxy)-ethoxy]-ethoxy}-ethoxy)-4-nitro-benzene
1-{4-nitrophenyl}-3,5-diphenyl-4,5-dihydro-1H-pyrazole
3-(o-nitrophenylsulfonyl)-1-propyne
