['C=C(C)C', 'CCNc1ccccc1CO', 'CC', 'C=C(C)CNc1ccccc1CO', 'C=C(C)CNCC', 'OCc1ccccc1', 'CO', 'C=C(C)CN(CC)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.