['CNCC(C)C#N', 'O=Cc1ccc2c(c1)OCCO2', 'CC(C)C#N', 'CNC(=O)c1ccc2c(c1)OCCO2', 'CC(C#N)CN(C)C=O', 'c1ccc2c(c1)OCCO2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)OCCO2.