['NC=O', 'CCOc1ccc(S(N)(=O)=O)cc1', 'CC', 'NC(=O)NS(=O)(=O)c1ccc(O)cc1', 'CCO', 'NC(=O)NS(=O)(=O)c1ccccc1', 'NC(N)=O', 'CCOc1ccc([SH](=O)=O)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.