['c1ccccc1', 'CC(C)n1c(/C=C/C=O)nc2ccccc21', 'CC(=O)c1ccccc1', 'Cc1nc2ccccc2n1C(C)C', 'CCC', 'O=C(/C=C/c1nc2ccccc2[nH]1)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(/C=C/c1nc2ccccc2[nH]1)c1ccccc1.