['CCCC', 'C[C@@H](OCCO)C(=O)O', 'CCCCO', 'CCO[C@H](C)C(=O)O', 'C[C@@H](O)C(=O)O', 'CCCCOCC', 'CCC(=O)O', 'CCCCOCCO']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is None.