['CCN1CCCS1(=O)=O', 'CC1(C)CCNCCS1(=O)=O', 'O=S1(=O)CCCN1', 'CCN1CCC(C)(C)S(=O)(=O)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S1(=O)CCCN(CCN2CCCS2(=O)=O)CC1.