Using CCCCBr, O=c1cnn(-c2ccc([N+](=O)[O-])cc2)c(=O)[nH]1 to produce CCCCn1c(=O)cnn(-c2ccc([N+](=O)[O-])cc2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.