Using CN, O=C(O)c1cc(S(=O)(=O)Cl)c(Br)c2c1OCCC2 to produce CNS(=O)(=O)c1cc(C(=O)O)c2c(c1Br)CCCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.