Using CC(=O)N[C@@H](Cc1cc(F)cc(F)c1)[C@H](O)CNC1CCN(C(=O)OCc2ccccc2)c2ccc(CC(C)(C)C)cc21 to produce CC(=O)N[C@@H](Cc1cc(F)cc(F)c1)[C@H](O)CNC1CCNc2ccc(CC(C)(C)C)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.