Using Cc1cc(-c2nc3cnc(Oc4ccccc4F)cc3o2)cc(C)c1O, CC(C)(C)OC(=O)CBr to produce Cc1cc(-c2nc3cnc(Oc4ccccc4F)cc3o2)cc(C)c1OCC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.