['CS(N)(=O)=O', 'CC1(CO)CC2(CCC2)C1', 'C[SH](=O)=O', 'NCC1(CO)CC2(CCC2)C1', 'CNS(C)(=O)=O', 'OCC1CC2(CCC2)C1', 'CO', 'CS(=O)(=O)NCC1CC2(CCC2)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CC2(C1)CCC2.