Using CC(C)(C)C[C@H](NC(=O)[C@@H](CC(C)(C)C)NC(=O)OC(C)(C)C)C(=O)O to produce CC(C)(C)C[C@@H](N)C(=O)N[C@@H](CC(C)(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.