Using Cc1cc(C)cc(CBr)c1, CCOC(=O)C(CC(=O)OC(C)(C)C)C(=O)OCC to produce CCOC(=O)C(CC(=O)OC(C)(C)C)(Cc1cc(C)cc(C)c1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.