['CN(CC#N)CC=O', 'Nc1ccc(Cl)c(Cl)c1', 'CC#N', 'CNCC(=O)Nc1ccc(Cl)c(Cl)c1', 'CNCC#N', 'CC(=O)Nc1ccc(Cl)c(Cl)c1', 'Clc1ccccc1Cl', 'CN(CC#N)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.