['CO', 'CN(C)CCNc1nc2cccc(Cl)c2s1', 'CCN(C)C', 'COc1ccc(Cl)c2sc(N)nc12', 'CNC', 'CCNc1nc2c(OC)ccc(Cl)c2s1', 'CN(C)CCN', 'COc1ccc(Cl)c2scnc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2scnc2c1.