Using CNCC(=O)C(CCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21)C(=O)NC to produce CNCC(=O)C(CCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21)C(N)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.