['CO', 'COc1ccc(Cl)cc1CNCCO', 'COc1cc(Cl)cc(CNCCO)c1', 'NCCO', 'COc1cc(Cl)cc(C)c1OC', 'CCO', 'COc1cc(Cl)cc(CN)c1OC', 'CNCCO', 'COc1ccc(Cl)cc1OC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.