['N[C@@H]1CCS(=O)(=O)C1', 'N#C/C(C=O)=N\\Nc1ccc(Cl)cc1', 'O=S1(=O)CCCC1', 'N#C/C(=N\\Nc1ccc(Cl)cc1)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C=NNc1ccccc1)N[C@@H]1CCS(=O)(=O)C1.