Using COc1ccc2c(c1)N1CCOCC1CN=C2c1ccco1, O=C(OO)c1cccc(Cl)c1 to produce COc1ccc2c(c1)N1CCOCC1C[N+]([O-])=C2c1ccco1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.