['CC=O', 'CC(N)c1ccc(OCC(F)(F)F)cc1', 'CC(F)(F)F', 'CC(=O)NC(C)c1ccc(O)cc1', 'OCC(F)(F)F', 'CC(=O)NC(C)c1ccccc1', 'CC(N)=O', 'CCc1ccc(OCC(F)(F)F)cc1', 'CCNC(C)=O', 'FC(F)(F)COc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.