['CC(CN)CO', 'O=CC(=O)Nc1ccc(F)c(Cl)c1', 'Nc1ccc(F)c(Cl)c1', 'CC(CO)CNC(=O)C=O', 'CC(C)CO', 'NC(=O)C(=O)Nc1ccc(F)c(Cl)c1', 'Fc1ccccc1Cl', 'CC(CO)CNC(=O)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.