Using COS(=O)(=O)OC, CCc1cc2c(c(O)c1C=O)C(C)(C)CCC2(C)C to produce CCc1cc2c(c(OC)c1C=O)C(C)(C)CCC2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.