['CCO', 'O=Cc1noc(-c2ccccc2)c1F', 'CC', 'O=C(O)c1noc(-c2ccccc2)c1F', 'CCOC=O', 'Fc1cnoc1-c1ccccc1', 'c1ccccc1', 'CCOC(=O)c1nocc1F']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2ccno2)cc1.