['N[C@@H]1C=C[C@H](CO)C1', 'O=Cc1cn2ccnc2s1', 'OC[C@H]1C=CCC1', 'NC(=O)c1cn2ccnc2s1', 'c1cn2ccsc2n1', 'O=CN[C@@H]1C=C[C@H](CO)C1', 'CO', 'O=C(N[C@@H]1C=CCC1)c1cn2ccnc2s1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(N[C@@H]1C=CCC1)c1cn2ccnc2s1.