['CO', 'C[C@@H]1Cc2cc(-c3cc(C=O)no3)ccc2O1', 'COC=O', 'C[C@@H]1Cc2cc(-c3ccno3)ccc2O1', 'COC(=O)c1ccon1', 'C[C@@H]1Cc2ccccc2O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc(-c2ccc3c(c2)CCO3)on1.