Using O=S([O-])[O-], CCOC(=O)c1ncc(O)c2c1CCN(Cc1ccc(F)c(Cl)c1)C2=O to produce CCOC(=O)c1c2c(c(O)c[n+]1[O-])C(=O)N(Cc1ccc(F)c(Cl)c1)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.