Using Cl, CCOC(=O)c1cccc(-c2cnc(N)c([N+](=O)[O-])c2)c1 to produce CCOC(=O)c1cccc(-c2cnc(Cl)c([N+](=O)[O-])c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.