Using COC(=O)[C@H](CNC(=O)OC(C)(C)C)N1CCN(S(C)(=O)=O)CC1 to produce COC(=O)[C@H](CN)N1CCN(S(C)(=O)=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.