Using COC(=O)[C@@H]1CCCN1, CC(C)[C@H](NC(=O)OC(C)(C)C)C(=O)O to produce COC(=O)[C@@H]1CCCN1C(=O)[C@@H](N)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.