Using O=S(=O)(O)Cl, COc1ccc2c(c1)C(C)(C)C(=O)CC2 to produce COc1cc2c(cc1S(=O)(=O)Cl)CCC(=O)C2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.