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