['CNCC(C)C#N', 'Cc1nc(-c2ccc(C)c(F)c2)no1', 'CC(C)C#N', 'CNCc1nc(-c2ccc(C)c(F)c2)no1', 'CC(C#N)CN(C)C', 'Cc1ccc(-c2ncon2)cc1F', 'Cc1ccccc1F', 'CC(C#N)CN(C)Cc1ncno1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2ncon2)cc1.