Using O=C(NCC1CN(c2ccc(NS(=O)(=O)CCCCl)cc2)C(=O)O1)c1ccc(Cl)s1 to produce O=C(NCC1CN(c2ccc(N3CCCS3(=O)=O)cc2)C(=O)O1)c1ccc(Cl)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.