Using CCc1ccc(C(C)(C)C(=O)O)cc1I, CC(C)(C)C(C(=O)O)C(=O)O to produce CCc1ccc(C(C)(C)C(=O)C(C(=O)O)C(C)(C)C)cc1I, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.