Using O, CSc1cc(-c2nc3c(C)cc(Cl)cc3c(=O)o2)n(-c2ncccc2Cl)n1 to produce Cc1cc(Cl)cc2c(=O)oc(-c3cc(S(C)=O)nn3-c3ncccc3Cl)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.