['CCC', 'N#CCCCOc1ccc(O)cc1', 'CCCC#N', 'CCCOc1ccc(O)cc1', 'CCCO', 'N#CCCCOc1ccccc1', 'N#CCCCO', 'CCCOc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.