['C1CCNC1', 'COc1ccc(Br)cc1/C=C/C=O', 'CO', 'O=C(/C=C/c1cccc(Br)c1)N1CCCC1', 'CC(=O)N1CCCC1', 'COc1ccc(Br)cc1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(/C=C/c1ccccc1)N1CCCC1.