['CC(=O)O', 'CNS(=O)(=O)c1ccc(O)c(C)c1', 'O=C(O)CO', 'CNS(=O)(=O)c1cccc(C)c1', 'CN', 'Cc1cc([SH](=O)=O)ccc1OCC(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.