Using CCCCNC(=O)[C@H](C)C[C@H](O)[C@H](CC(C)(C)CC(=O)N1CC(C(=O)OC(C)(C)C)Cc2ccccc21)NC(=O)OC(C)(C)C to produce CCCCNC(=O)[C@H](C)C[C@H](O)[C@@H](N)CC(C)(C)CC(=O)N1CC(C(=O)OC(C)(C)C)Cc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.