Using CC(=O)OC(C)=O, NCC(=O)Nc1ccc(OCc2ccc(F)cc2)cc1F to produce O=CNCC(=O)Nc1ccc(OCc2ccc(F)cc2)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.