Using N#CCCl, COc1ccc(C(=O)C2CCN(C3CCNC3=O)CC2)cc1 to produce COc1ccc(C(=O)C2CCN(C3CCN(CC#N)C3=O)CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.