Using O=C([O-])[O-], CC(C)CCN1C(=O)C(C2=NS(=O)(=O)c3cc(NS(C)(=O)=O)ccc3N2)=C(O)C2CCCCCC21 to produce CC(C)CCN1C(=O)C(C2=NS(=O)(=O)c3cc(N(C)S(C)(=O)=O)ccc3N2)=C(O)C2CCCCCC21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.