['CO', 'Nc1nc(-c2cccs2)c(NC=O)s1', 'COC=O', 'Nc1nc(-c2cccs2)c(N)s1', 'COC(N)=O', 'Nc1nc(-c2cccs2)cs1', 'c1ccsc1', 'COC(=O)Nc1cnc(N)s1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1csc(-c2cscn2)c1.