['Cc1nnsc1C', 'NS(=O)(=O)C1COC1', 'O=[SH](=O)C1COC1', 'Cc1nnsc1CN', 'Cc1csnn1', 'CNS(=O)(=O)C1COC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(NCc1cnns1)C1COC1.