['Oc1ccc(F)cc1', 'O=C(O)CCc1ccccc1', 'Fc1ccccc1', 'O=C(O)CCc1cccc(O)c1', 'CCC(=O)O', 'Fc1ccc(Oc2ccccc2)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(Oc2ccccc2)cc1.