Using O=C1CSc2ccc([N+](=O)[O-])cc2N1, CCOC(=O)C(C)Br to produce CCOC(=O)C(C)N1C(=O)CSc2ccc([N+](=O)[O-])cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.