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