['OCC(F)(F)F', 'CCCN1CCN(CC#N)CC1', 'CC(F)(F)F', 'N#CCN1CCN(CCCO)CC1', 'CC#N', 'FC(F)(F)COCCCN1CCNCC1', 'CCCOCC(F)(F)F', 'N#CCN1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNCCN1.