Using CS(=O)(=O)Cl, COC(=O)c1c([N+](=O)[O-])ccc(N(CCO)CCO)c1[N+](=O)[O-] to produce COC(=O)c1c([N+](=O)[O-])ccc(N(CCOS(C)(=O)=O)CCOS(C)(=O)=O)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.