['CC=O', 'CC1(C)CN(C(=O)[C@H]2C[C@H](O)CN2)CCS1', 'CC1(C)CNCCS1', 'CC(=O)N1C[C@@H](O)C[C@@H]1C=O', 'CC(=O)N1CC[C@H](O)C1', 'CC1(C)CN(C=O)CCS1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C([C@H]1CCCN1)N1CCSCC1.