['CC', 'O=C1CC(=O)CC(c2ccccc2O)C1', 'CCO', 'O=C1CC(=O)CC(c2ccccc2)C1', 'O=C1CCCC(=O)C1', 'CCOc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CC(=O)CC(c2ccccc2)C1.