['CC(C)(C)NCC=O', 'Nc1cccc(OC(F)(F)F)c1', 'OC(F)(F)F', 'CC(C)(C)NCC(=O)Nc1ccccc1', 'CC(C)C', 'NCC(=O)Nc1cccc(OC(F)(F)F)c1', 'CC(C)(C)N', 'CC(=O)Nc1cccc(OC(F)(F)F)c1', 'CC(C)(C)NCC(N)=O', 'FC(F)(F)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.