['O=CN[C@@H]1CCCOC1', 'NS(=O)(=O)C1CCCNC1', 'N[C@@H]1CCCOC1', 'NS(=O)(=O)C1CCCN(C=O)C1', 'C1CCOCC1', 'NC(=O)N1CCCC(S(N)(=O)=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(N[C@@H]1CCCOC1)N1CCCCC1.