['C1COCC2(CC2)N1', 'CS(=O)(=O)CC1(CC=O)CC1', 'CS(C)(=O)=O', 'O=C(CC1CC1)N1CCOCC12CC2', 'CS(=O)(=O)CC1CC1', 'CC(=O)N1CCOCC12CC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CC1CC1)N1CCOCC12CC2.