Using BrCCCBr, CCOC(=O)Cc1ccc([N+](=O)[O-])cc1 to produce CCOC(=O)C1(c2ccc([N+](=O)[O-])cc2)CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.