['CNC1(C#N)CCC1', 'O=C/C=C/c1c(Cl)cccc1Cl', 'N#CC1CCC1', 'CNC(=O)/C=C/c1c(Cl)cccc1Cl', 'N#CC1CCC1', 'Cc1c(Cl)cccc1Cl', 'CC(=O)N(C)C1(C#N)CCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(/C=C/c1ccccc1)NC1CCC1.