['C1CCC(C2CCCN2)C1', 'O=[N+]([O-])c1cccc(Cl)c1[SH](=O)=O', 'C1CCCC1', 'O=[N+]([O-])c1cccc(Cl)c1S(=O)(=O)N1CCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1ccccc1)N1CCCC1C1CCCC1.