['O[C@@H]1CCNC1', 'CSC1(C=O)CC1', 'CS', 'O=C(C1CC1)N1CC[C@@H](O)C1', 'CSC1CC1', 'O=CN1CC[C@@H](O)C1', 'O=C(C1CC1)N1CC[C@@H](O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C1CC1)N1CCCC1.