['CC(C)O', 'Nc1nc(SCC=O)nc2sccc12', 'CCC', 'Nc1nc(SCC(=O)O)nc2sccc12', 'CC(=O)OC(C)C', 'Nc1nc(S)nc2sccc12', 'CC(C)OC(=O)CS', 'Nc1ncnc2sccc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ncc2ccsc2n1.