['CC(C)(C)O', 'O=CN1CCN(c2ccsc2[N+](=O)[O-])CC1', 'CC(C)(C)OC=O', 'O=[N+]([O-])c1sccc1N1CCNCC1', 'CC(C)C', 'O=C(O)N1CCN(c2ccsc2[N+](=O)[O-])CC1', 'O=[N+]([O-])c1cccs1', 'CC(C)(C)OC(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc(N2CCNCC2)cs1.