['CCCCS(N)(=O)=O', 'CCN1CCN(S(C)(=O)=O)CC1', 'CCCCS(=O)(=O)NCC', 'CS(=O)(=O)N1CCNCC1', 'CCCC[SH](=O)=O', 'CS(=O)(=O)N1CCN(CCN)CC1', 'C[SH](=O)=O', 'CCCCS(=O)(=O)NCCN1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNCCN1.