['CCCN', 'O=Cc1cn[nH]c1C(F)(F)F', 'CCC', 'NC(=O)c1cn[nH]c1C(F)(F)F', 'CCCNC=O', 'FC(F)(F)c1ccn[nH]1', 'FC(F)F', 'CCCNC(=O)c1cn[nH]c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn[nH]c1.