['c1ccc(C2CCCCC2)cc1', 'O=[N+]([O-])c1cccc(S(=O)(=O)O)c1', 'C1CCCCC1', 'O=[N+]([O-])c1cccc(S(=O)(=O)Oc2ccccc2)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(Oc1ccc(C2CCCCC2)cc1)c1ccccc1.