['C=CCN', 'CCCN(CC=O)C1CCc2ccccc2C1', 'C=CC', 'CCCN(CC(N)=O)C1CCc2ccccc2C1', 'C=CCNC(C)=O', 'CCCNC1CCc2ccccc2C1', 'CCC', 'C=CCNC(=O)CNC1CCc2ccccc2C1', 'c1ccc2c(c1)CCCC2', 'C=CCNC(=O)CNCCC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCCC2.