['CCNCC', 'CC(C)(CC(=O)O)CC(=O)Nc1ccccc1C=O', 'CC(C)(CC=O)CC(=O)O', 'CCN(CC)C(=O)c1ccccc1N', 'CC', 'CCNC(=O)c1ccccc1NC(=O)CC(C)(C)CC(=O)O', 'CC(C)(CC(N)=O)CC(=O)O', 'CCN(CC)C(=O)c1ccccc1', 'CCN(C=O)CC', 'CC(C)(CC(=O)O)CC(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.