Using O=C1c2ccccc2C(=O)N1O, CC(C)(C)OC(=O)C(Br)c1ccccc1 to produce CC(C)(C)OC(=O)C(ON1C(=O)c2ccccc2C1=O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.