Using BrCc1ccccc1, O=Cc1[nH]c(-c2ccc([N+](=O)[O-])cc2)nc1Cl to produce O=Cc1c(Cl)nc(-c2ccc([N+](=O)[O-])cc2)n1Cc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.