['O=[SH](=O)/C=C/c1ccccc1', 'Cc1cn2nc(N3CCNCC3)sc2n1', 'Cc1cn2ncsc2n1', 'O=S(=O)(/C=C/c1ccccc1)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(/C=C/c1ccccc1)N1CCN(c2nn3ccnc3s2)CC1.