['CC', 'CC(CO)NS(=O)(=O)c1ncn(C)c1Cl', 'CCO', 'CC(C)NS(=O)(=O)c1ncn(C)c1Cl', 'CCCOCC', 'Cn1cnc(S(N)(=O)=O)c1Cl', 'CCOCC(C)N', 'Cn1cnc([SH](=O)=O)c1Cl']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1c[nH]cn1.