['CC(C)C', 'NC(=O)CNCCCS(=O)(=O)c1ccc(F)cc1', 'CC(C)CNCC(N)=O', 'CCCS(=O)(=O)c1ccc(F)cc1', 'CC(N)=O', 'CC(C)CNCCCS(=O)(=O)c1ccc(F)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.