['CC(C)(C)O', 'CCN(C)Cc1cccc(C#N)c1', 'CC(C)C', 'CN(CCO)Cc1cccc(C#N)c1', 'CCOC(C)(C)C', 'CNCc1cccc(C#N)c1', 'Cc1cccc(C#N)c1', 'CNCCOC(C)(C)C', 'N#Cc1ccccc1', 'CN(C)CCOC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.