['FC(F)F', 'Cn1ncc(Cc2ccccc2)c1N', 'Cc1ccccc1', 'Cn1nc(C(F)(F)F)cc1N', 'c1ccccc1', 'Cc1c(C(F)(F)F)nn(C)c1N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(Cc2cn[nH]c2)cc1.