['CC(C)(C)C=O', 'NCC(O)COc1cccc(C(F)(F)F)c1', 'Oc1cccc(C(F)(F)F)c1', 'CC(O)CNC(=O)C(C)(C)C', 'FC(F)(F)c1ccccc1', 'CC(C)(C)C(=O)NCC(O)CO', 'CC(C)(C)C(N)=O', 'CC(O)COc1cccc(C(F)(F)F)c1', 'FC(F)F', 'CC(C)(C)C(=O)NCC(O)COc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.