['CC(C)N', 'O=CCC(=O)Nc1cc(Cl)cc(Cl)c1', 'CC(C)NC(=O)CC=O', 'Nc1cc(Cl)cc(Cl)c1', 'CCC', 'NC(=O)CC(=O)Nc1cc(Cl)cc(Cl)c1', 'Clc1cccc(Cl)c1', 'CC(C)NC(=O)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.