Using O=[N+]([O-])c1ccc(F)c(F)c1F, CCOC(=O)CC(C)=O to produce CC(=O)Cc1c([N+](=O)[O-])ccc(F)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.