['COCCOCCC=O', 'Nc1ccc(Cl)cc1F', 'CO', 'CCOCCC(=O)Nc1ccc(Cl)cc1F', 'CCOC', 'O=C(CCO)Nc1ccc(Cl)cc1F', 'COCCO', 'CCC(=O)Nc1ccc(Cl)cc1F', 'Fc1cccc(Cl)c1', 'COCCOCCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.