['CO', 'CCN(C)Cc1cccc(OC(F)F)c1', 'OC(F)F', 'COCCN(C)Cc1ccccc1', 'CCOC', 'CNCc1cccc(OC(F)F)c1', 'CNCCOC', 'Cc1cccc(OC(F)F)c1', 'COCCN(C)C', 'FC(F)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.