Using O=[N+]([O-])c1ccc(O)cc1, COc1cc(C)c(CCCCCCCCCC(=O)O)c(O)c1OC to produce COc1cc(C)c(CCCCCCCCCC(=O)Oc2ccc([N+](=O)[O-])cc2)c(O)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.