['CC(C)(C)O', 'Cc1c(S(=O)(=O)N2CCNCC2)c2ccccc2n1C', 'CC(C)(O)CN1CCNCC1', 'Cc1c([SH](=O)=O)c2ccccc2n1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1c[nH]c2ccccc12)N1CCNCC1.