Using O=CC(=O)O, COC(=O)CCc1ccc(O)c(C(C)(C)C)c1 to produce COC(=O)CCc1cc2c(c(C(C)(C)C)c1)OC(=O)C2O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.