Using O=C(OCc1ccccc1)c1ccc(Oc2c(F)c(O)c([N+](=O)[O-])c(F)c2F)cc1 to produce Nc1c(O)c(F)c(Oc2ccc(C(=O)O)cc2)c(F)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.