Using COC(=O)C(C)(C)C(c1cccc(F)c1)c1ccc(Br)s1 to produce CC(C)(C(=O)O)C(c1cccc(F)c1)c1ccc(Br)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.