Using O=S(Cl)Cl, CCOC(=O)c1c[nH]c2c([N+](=O)[O-])cccc2c1=O to produce CCOC(=O)c1cnc2c([N+](=O)[O-])cccc2c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.