Using c1ccccc1, CC(C)(C)c1cc2c(c(C(C)(C)C)c1)OC(=O)C2O to produce CC(C)(C)c1cc2c(c(C(C)(C)C)c1)OC(=O)C2c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.