['CC(=O)Cl', 'Cc1ccc(-c2ccc(O)cc2)cc1', 'O=C(Cl)CO', 'Cc1ccc(-c2ccccc2)cc1', 'Cc1ccccc1', 'O=C(Cl)COc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2ccccc2)cc1.