Using CNC(=O)[C@@H](NC(=O)c1nc(-c2cc(F)c(F)cc2F)n2c1CN(CC(=O)OC(C)(C)C)CC2)C(C)(C)C to produce CNC(=O)[C@@H](NC(=O)c1nc(-c2cc(F)c(F)cc2F)n2c1CN(CC(=O)O)CC2)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.