Using CC(=O)CC(C)=O, Cc1cc(=O)c2c(F)c(F)cc(C=O)c2o1 to produce CC(=O)C(=Cc1cc(F)c(F)c2c(=O)cc(C)oc12)C(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.