Using [NH4+], COC(=O)CC(=O)Nc1ccc(OCc2ccc(F)cc2)cc1F to produce NC(=O)CC(=O)Nc1ccc(OCc2ccc(F)cc2)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.