['CC', 'CC(CO)NS(=O)(=O)c1cccc(F)c1[N+](=O)[O-]', 'CCO', 'CC(C)NS(=O)(=O)c1cccc(F)c1[N+](=O)[O-]', 'CCCOCC', 'NS(=O)(=O)c1cccc(F)c1[N+](=O)[O-]', 'CCOCC(C)N', 'O=[N+]([O-])c1c(F)cccc1[SH](=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.