['CCC(CC)(CC=O)C(=O)O', 'CCOc1ccc(C#N)cc1N', 'CC', 'CCC(CC)(CC(=O)Nc1cc(C#N)ccc1O)C(=O)O', 'CCO', 'CCC(CC)(CC(=O)Nc1cccc(C#N)c1)C(=O)O', 'CCOc1ccc(C#N)cc1', 'CCC(CC)(CC(N)=O)C(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.