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