Using COC(=O)c1cccc(COc2nc(Cl)cnc2NS(=O)(=O)c2cccc(Cl)c2Cl)c1 to produce O=C(O)c1cccc(COc2nc(Cl)cnc2NS(=O)(=O)c2cccc(Cl)c2Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.