['CO', 'CN(Cc1ccccc1)S(=O)(=O)CCCC=O', 'Cc1ccccc1', 'CNS(=O)(=O)CCCC(=O)OC', 'CNCc1ccccc1', 'COC(=O)CCC[SH](=O)=O', 'c1ccccc1', 'COC(=O)CCCS(=O)(=O)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.