['O=C1CNCN1C1CC1', 'O=[SH](=O)c1cccc(Br)c1', 'C1CC1', 'O=C1CN(S(=O)(=O)c2cccc(Br)c2)CN1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CN(S(=O)(=O)c2ccccc2)CN1C1CC1.