Using NCc1ccc(F)c(Br)c1, CC(C)(C)OC(=O)OC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)NCc1ccc(F)c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.