['NC(=O)C1CCNCC1', 'O=CCS(=O)(=O)c1ccc(Cl)cc1', 'NC=O', 'O=C(CS(=O)(=O)c1ccc(Cl)cc1)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CS(=O)(=O)c1ccccc1)N1CCCCC1.