['CC', 'Oc1ccc(-n2cc[nH]c2=S)cc1', 'CCO', 'S=c1[nH]ccn1-c1ccccc1', 'S=c1[nH]cc[nH]1', 'CCOc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is S=c1[nH]ccn1-c1ccccc1.