['C#CC', 'O=C(O)c1ccc(CO)cc1', 'C#CCO', 'Cc1ccc(C(=O)O)cc1', 'O=CO', 'C#CCOCc1ccccc1', 'C#CCOC', 'O=C(O)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.