Using CS(=O)(=O)c1nc2nc(Cl)nc(N3CCOCC3)c2s1, CS(=O)(=O)N1CCNCC1 to produce CS(=O)(=O)N1CCN(c2nc3nc(Cl)nc(N4CCOCC4)c3s2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.