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