['CO', 'CS(=O)(=O)N1C[C@@H](O)C[C@@H]1C=O', 'C[SH](=O)=O', 'COC(=O)[C@H]1C[C@H](O)CN1', 'COC=O', 'CS(=O)(=O)N1CC[C@H](O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNC1.