['CSC1(C)CC1', 'CC1(F)CCNC1', 'CS', 'CC1(F)CCN(CC2CC2)C1', 'CSC1CC1', 'CN1CCC(C)(F)C1', 'CC1(F)CCN(CC2CC2)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCN(CC2CC2)C1.