['CO', 'CSc1ncc(Cl)c(C(=O)N(C)CC(C)C=O)n1', 'CNCC(C)C(=O)OC', 'CSc1ncc(Cl)c(C=O)n1', 'COC(=O)C(C)C', 'CNC(=O)c1nc(SC)ncc1Cl', 'CSc1ncc(Cl)cn1', 'COC(=O)C(C)CN(C)C=O', 'CS', 'COC(=O)C(C)CN(C)C(=O)c1ncncc1Cl']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cncnc1.