['CO', 'CC1CN(S(=O)(=O)c2cccnc2)CCS(=O)(=O)C1', 'CC1CNCCS(=O)(=O)C1', 'COc1cncc([SH](=O)=O)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)CCCN(S(=O)(=O)c2cccnc2)CC1.