Using Cc1ccc(-c2ccc(Cl)cc2)cc1Br, C#CC(C)(C)OCC(=O)OC to produce COC(=O)COC(C)(C)C#Cc1cc(-c2ccc(Cl)cc2)ccc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.