['CO', 'CCN(CC)CCNc1nc2ccccc2s1', 'CC', 'CCNCCNc1nc2ccc(OC)cc2s1', 'CCNCC', 'CCNc1nc2ccc(OC)cc2s1', 'CCN(CC)CC', 'COc1ccc2nc(N)sc2c1', 'CCN(CC)CCN', 'COc1ccc2ncsc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2scnc2c1.