['C[C@H]1CS(=O)(=O)C[C@H]1N', 'CCC(C=O)N1CCCC1=O', 'C[C@@H]1CCS(=O)(=O)C1', 'CCC(C(N)=O)N1CCCC1=O', 'O=C1CCCN1', 'CCCC(=O)N[C@@H]1CS(=O)(=O)C[C@@H]1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CN1CCCC1=O)N[C@H]1CCS(=O)(=O)C1.