['CO', 'CC(C=O)CN(C)C(=O)c1cc2ccccc2oc1=O', 'CNCC(C)C(=O)OC', 'O=Cc1cc2ccccc2oc1=O', 'COC(=O)C(C)C', 'CNC(=O)c1cc2ccccc2oc1=O', 'COC(=O)C(C)CN(C)C=O', 'O=c1ccc2ccccc2o1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1ccc2ccccc2o1.