['CCC', 'COc1cc(CN)cc(Cl)c1O', 'CO', 'CC(C)Oc1ccc(CN)cc1Cl', 'CC(C)O', 'COc1cc(Cl)cc(CN)c1', 'CN', 'COc1cccc(Cl)c1OC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.