['CC(=O)/N=c1\\sccn1C', 'c1csc(-c2nccs2)c1', 'c1ccsc1', 'Cn1ccs/c1=N\\C(=O)Cc1cscn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(Cc1csc(-c2cccs2)n1)/N=c1/[nH]ccs1.