Using O=S(=O)(Cl)c1c(Cl)cccc1Cl, CCP(=O)(CO)OC(C)C to produce CCP(=O)(COS(=O)(=O)c1c(Cl)cccc1Cl)OC(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.