['C[SH](=O)=O', 'O=[N+]([O-])c1ccc(NC2CCCNC2)c(Cl)c1', 'O=[N+]([O-])c1cccc(Cl)c1', 'CS(=O)(=O)N1CCCC(N)C1', 'CS(=O)(=O)N1CCCCC1', 'Nc1ccc([N+](=O)[O-])cc1Cl']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(NC2CCCNC2)cc1.