['Cc1noc(C)c1CN', 'CC(C)(C)CC(=O)NCC=O', 'CC(C)(C)CC=O', 'Cc1noc(C)c1CNC(=O)CN', 'Cc1noc(C)c1C', 'CC(C)(C)CC(=O)NCC(N)=O', 'CC(C)(C)CC(N)=O', 'CC(=O)NCc1c(C)noc1C', 'Cc1cc(C)on1', 'CNC(=O)CNC(=O)CC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.