['NS(=O)(=O)C1CCCNC1', 'O=[SH](=O)CC12CCC(CC1)C2', 'C1CC2CCC1C2', 'CS(=O)(=O)N1CCCC(S(N)(=O)=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(CC12CCC(CC1)C2)N1CCCCC1.