['CNC', 'Cc1[nH]nc(N)c1-c1cccc(F)c1', 'CN(C)C', 'Nc1n[nH]cc1-c1cccc(F)c1', 'Fc1ccccc1', 'CN(C)Cc1cc(N)n[nH]1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2cn[nH]c2)cc1.