['C[SH](=O)=O', 'CC1CN(S(=O)(=O)NC2CCCNC2)CC(C)O1', 'CS(=O)(=O)N1CCCCC1', 'CC1CN(S(N)(=O)=O)CC(C)O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(NC1CCCNC1)N1CCOCC1.