['CCCN(CC#N)CC=O', 'Nc1ccc(F)c(F)c1F', 'CCC', 'N#CCNCC(=O)Nc1ccc(F)c(F)c1F', 'CC#N', 'CCCNCC(=O)Nc1ccc(F)c(F)c1F', 'CCCNCC#N', 'CC(=O)Nc1ccc(F)c(F)c1F', 'Fc1cccc(F)c1F', 'CCCN(CC#N)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.