['N#CCCNCCC#N', 'O=Cc1ccc2c(c1)CCC2', 'CCC#N', 'N#CCCNC(=O)c1ccc2c(c1)CCC2', 'c1ccc2c(c1)CCC2', 'N#CCCN(C=O)CCC#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCC2.