Using CC(C)(C)OC(=O)N1CCCC(C(=O)O)C1, C=CC(F)(F)Br to produce CC(C)(C)OC(=O)N1CCCC(C(=O)OCC=C(F)F)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.