Using O=C(O)c1c(Cl)cccc1Cl, CCCC1(C)C(=O)N(CCl)S(=O)(=O)N1C to produce CCCC1(C)C(=O)N(COC(=O)c2c(Cl)cccc2Cl)S(=O)(=O)N1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.