Using CC(C)(C)P(=O)(C(C)(C)C)C(F)(F)c1ccc(Br)cc1, CCOC=O to produce CC(C)(C)P(=O)(C(C)(C)C)C(F)(F)c1ccc(C=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.