Using O=c1cc(-c2cccnc2C(F)(F)F)oc2c([N+](=O)[O-])cccc12 to produce Nc1cccc2c(=O)cc(-c3cccnc3C(F)(F)F)oc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.