['CO', 'CCc1nsc(N2CCC(C)S(=O)(=O)CC2)n1', 'COC(C)c1ncsn1', 'CC1CCNCCS1(=O)=O', 'CCOC', 'CC1CCN(c2ncns2)CCS1(=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)CCCN(c2ncns2)CC1.