['Nc1ccc2c(c1)CCO2', 'Cc1ccc([SH](=O)=O)cc1', 'c1ccc2c(c1)CCO2', 'Cc1ccc(S(N)(=O)=O)cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(Nc1ccc2c(c1)CCO2)c1ccccc1.