['CC', 'CN(C)CCNc1nc2c(O)cccc2s1', 'CCO', 'CN(C)CCNc1nc2ccccc2s1', 'CCN(C)C', 'CCOc1cccc2sc(N)nc12', 'CNC', 'CCNc1nc2c(OCC)cccc2s1', 'CN(C)CCN', 'CCOc1cccc2scnc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2scnc2c1.