['CCCCCCN', 'CCOC(C=O)c1ccccc1', 'CCO', 'CCCCCCNC(=O)Cc1ccccc1', 'CC', 'CCCCCCNC(=O)C(O)c1ccccc1', 'CCCCCC', 'CCOC(C(N)=O)c1ccccc1', 'c1ccccc1', 'CCCCCCNC(=O)COCC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.