Using O=C([O-])O, CC(C)(C)OC(=O)N1CCC2(CC1)SCc1ccccc12 to produce CC(C)(C)OC(=O)N1CCC2(CC1)c1ccccc1CS2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.