['C1CCNCC1', 'O=Cc1cn[nH]c1C(F)(F)F', 'O=CN1CCCCC1', 'FC(F)(F)c1ccn[nH]1', 'FC(F)F', 'O=C(c1cn[nH]c1)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(c1cn[nH]c1)N1CCCCC1.