['C1CN(C2CC2)CCN1', 'Cn1ncc(Cl)c1[SH](=O)=O', 'C1CC1', 'Cn1ncc(Cl)c1S(=O)(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1ccn[nH]1)N1CCN(C2CC2)CC1.