['CSCCC=O', 'Nc1ccc(-c2nccs2)cc1', 'CS', 'CCC(=O)Nc1ccc(-c2nccs2)cc1', 'CSCCC(N)=O', 'c1ccc(-c2nccs2)cc1', 'c1cscn1', 'CSCCC(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2nccs2)cc1.