Using O=C(CBr)c1ccccc1, CC(C)(C)OC(=O)NC(C(=O)O)c1ccc(O)cc1 to produce CC(C)(C)OC(=O)NC(C(=O)OCC(=O)c1ccccc1)c1ccc(O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.