Using O=c1c(-c2ccc(O)cc2)coc2cc(O)ccc12, O=[N+]([O-])O to produce O=c1c(-c2ccc(O)c([N+](=O)[O-])c2)coc2cc(O)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.