Using CCOC(=O)C(O)(CC(C)(C)c1cc(Br)cc2c1OCC2)C(F)(F)F to produce CC(C)(CC(O)(CO)C(F)(F)F)c1cc(Br)cc2c1OCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.