['CN(CC#N)CC=O', 'Cc1cc(Br)ccc1N', 'CNCC#N', 'CC(=O)Nc1ccc(Br)cc1C', 'CC#N', 'CNCC(=O)Nc1ccc(Br)cc1C', 'Cc1cccc(Br)c1', 'CN(CC#N)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.