Using COC(=O)c1nn(CCc2ccccc2)cc1NC(=O)CSc1ccc(Br)cc1 to produce O=C(CSc1ccc(Br)cc1)Nc1cn(CCc2ccccc2)nc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.