['NCc1ncn[nH]1', 'O=CNCC(F)(F)F', 'NCC(F)(F)F', 'O=CNCc1ncn[nH]1', 'Cc1ncn[nH]1', 'NC(=O)NCC(F)(F)F', 'CC(F)(F)F', 'NC(=O)NCc1ncn[nH]1', 'c1nc[nH]n1', 'CNC(=O)NCC(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nc[nH]n1.