['CCCNCCC', 'COc1cc(C=O)ccc1OCC=O', 'CCCN(CCC)C(C)=O', 'COc1cc(C=O)ccc1O', 'COc1cccc(C=O)c1', 'CCCN(CCC)C(=O)CO', 'CO', 'CCCN(CCC)C(=O)COc1ccc(C=O)cc1', 'CCC', 'CCCNC(=O)COc1ccc(C=O)cc1OC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.