Using O=[N+]=O, CCN1c2ncccc2C(=O)N(C(C)=O)c2c(C)cc(Cl)nc21 to produce CCN1c2ncccc2C(=O)N(C(C)=O)c2c1nc(Cl)c([N+](=O)[O-])c2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.