['CO', 'Nc1cc(CCc2ccccc2)[nH]n1', 'Nc1cc[nH]n1', 'CCc1ccc(OC)cc1', 'CCc1cc(N)n[nH]1', 'COc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(CCc2ccn[nH]2)cc1.