['CC#N', 'O=[N+]([O-])c1ccc(S(=O)(=O)N2CCNCC2)cc1', 'N#CCN1CCNCC1', 'O=[N+]([O-])c1ccc([SH](=O)=O)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1ccccc1)N1CCNCC1.