['CC/C=C(/C)C=O', 'O=[N+]([O-])c1cccc(S(=O)(=O)N2CCNCC2)c1', 'O=[N+]([O-])c1cccc([SH](=O)=O)c1', 'CC/C=C(/C)C(=O)N1CCNCC1', 'CCC', 'CCC(=O)N1CCN(S(=O)(=O)c2cccc([N+](=O)[O-])c2)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1ccccc1)N1CCNCC1.