['CC1(C)CCNCCS1(=O)=O', 'CC(C)n1cc([SH](=O)=O)cn1', 'CCC', 'CC1(C)CCN(S(=O)(=O)c2cn[nH]c2)CCS1(=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)CCCN(S(=O)(=O)c2cn[nH]c2)CC1.