['CCCCO', 'NS(=O)(=O)c1ccc(Cl)c(C=O)c1', 'CCCC', 'NS(=O)(=O)c1ccc(Cl)c(C(=O)O)c1', 'CCCCOC=O', 'NS(=O)(=O)c1ccc(Cl)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.