Using CS(=O)(=O)Cl, NCc1nnc(SCC2=C(C(=O)O)N3C(=O)C(NC(=O)Cc4cccs4)[C@H]3SC2)s1 to produce CS(=O)(=O)NCc1nnc(SCC2=C(C(=O)O)N3C(=O)C(NC(=O)Cc4cccs4)[C@H]3SC2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.