['Cc1cc(C)on1', 'c1nc(C2CC2)n[nH]1', 'Cc1ccon1', 'Cn1cnc(C2CC2)n1', 'C1CC1', 'Cc1cc(Cn2cncn2)on1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc(Cn2cnc(C3CC3)n2)on1.