['Cc1noc(C)c1CN', 'CC(C)CS(=O)(=O)CC=O', 'Cc1noc(C)c1C', 'CC(C)CS(=O)(=O)CC(N)=O', 'Cc1cc(C)on1', 'CNC(=O)CS(=O)(=O)CC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.