Using COC(=O)c1ccccc1CBr, CC(C)(C)OC(=O)NC(CO)Cc1ccc(Br)cc1 to produce COC(=O)c1ccccc1COCC(Cc1ccc(Br)cc1)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.