Using COC(=O)[C@H]1CC[C@H](N(C(=O)OC(C)(C)C)C(C)C)CC1 to produce COC(=O)[C@H]1CC[C@H](NC(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.