['CO', 'CCCN(CC)C1CCc2ccccc2C1', 'CCC', 'COCCNC1CCc2ccccc2C1', 'CCOC', 'CCCNC1CCc2ccccc2C1', 'CCCNCCOC', 'c1ccc2c(c1)CCCC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCCC2.