Using COC(=O)CN1C(=O)[C@H](NC(=O)OC(C)(C)C)Cc2ccccc21 to produce COC(=O)CN1C(=O)[C@H](N)Cc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.