['CC(C)C', 'NS(=O)(=O)N1CCN(CCO)CC1', 'CC(C)(C)O', 'CCN1CCN(S(N)(=O)=O)CC1', 'CCOC(C)(C)C', 'NS(=O)(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNCCN1.