['C/C=C/C=C/C=O', 'NC(c1ccccc1)c1ccccc1', 'C/C=C/C=C/C(N)=O', 'c1ccc(Cc2ccccc2)cc1', 'CC', 'C/C=C/C(=O)NC(c1ccccc1)c1ccccc1', 'C/C=C/C', 'CC(=O)NC(c1ccccc1)c1ccccc1', 'c1ccccc1', 'C/C=C/C=C/C(=O)NCc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(Cc2ccccc2)cc1.