['O=CNCC(F)(F)F', 'Cc1noc(C)c1CN', 'NCC(F)(F)F', 'Cc1noc(C)c1CNC=O', 'Cc1noc(C)c1C', 'NC(=O)NCC(F)(F)F', 'CC(F)(F)F', 'Cc1noc(C)c1CNC(N)=O', 'Cc1cc(C)on1', 'CNC(=O)NCC(F)(F)F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.