Using COc1ccc2c(Cc3c(Cl)cncc3Cl)nncc2c1, O=C(OO)c1cccc(Cl)c1 to produce COc1ccc2c(Cc3c(Cl)cncc3Cl)n[n+]([O-])cc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.