Using COC(=O)c1ccc2c(c1)S(=O)c1cc3c(cc1CC2)CCC3 to produce O=C(O)c1ccc2c(c1)S(=O)c1cc3c(cc1CC2)CCC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.