Using CCOC(=O)c1cnn(CC2CC(=O)N(c3ccc(F)cc3F)C2)c1 to produce O=C(O)c1cnn(CC2CC(=O)N(c3ccc(F)cc3F)C2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.