['CC(C)(CC=O)CC(=O)O', 'CCC(C)Oc1ccc(N)cc1', 'CCCC', 'CC(C)(CC(=O)O)CC(=O)Nc1ccc(O)cc1', 'CCC(C)O', 'CC(C)(CC(=O)O)CC(=O)Nc1ccccc1', 'CC(C)(CC(N)=O)CC(=O)O', 'CCC(C)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.