['CC(C)(CC=O)CC(=O)O', 'C=CCOc1cccc(N)c1', 'C=CC', 'CC(C)(CC(=O)O)CC(=O)Nc1cccc(O)c1', 'C=CCO', 'CC(C)(CC(=O)O)CC(=O)Nc1ccccc1', 'C=CCOc1ccccc1', 'CC(C)(CC(N)=O)CC(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.