['CO', 'CC(C)(Nc1ccccc1)C1=NCCS1', 'CC(C)C1=NCCS1', 'COc1ccc(N)cc1', 'COc1ccccc1', 'CC(C)(N)C1=NCCS1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(NCC2=NCCS2)cc1.