['CNC', 'Cc1sc(N)nc1-c1ccc2ccccc2c1', 'CN(C)C', 'Nc1nc(-c2ccc3ccccc3c2)cs1', 'CN(C)Cc1cnc(N)s1', 'c1ccc2ccccc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2cc(-c3cscn3)ccc2c1.