Using COC(=O)c1cc(O)cc(OCc2ccccc2F)c1, CC(C)(C)OC(=O)CBr to produce COC(=O)c1cc(OCC(=O)OC(C)(C)C)cc(OCc2ccccc2F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.