['CC', 'OCCNc1nc2ccccc2[nH]1', 'CCO', 'CCNc1nc2ccccc2[nH]1', 'CCOCC', 'Nc1nc2ccccc2[nH]1', 'CCOCCN', 'c1ccc2[nH]cnc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]cnc2c1.