\sixheterov[bdf]{4s==\raisebox{-1cm}{1}}{2==CO$\bf_2$H}[]
\sixheterov[bdf]{4s==\raisebox{-1cm}{2}}{2==SO$\bf_3$H}[]
\sixheterov[bdf]{4s==\raisebox{-1cm}{3}}{2==OH}[]
\qquad
\sixheterov[bdf]{4s==\raisebox{-1cm}{4}}{2==CO$\bf_2$H;5==H$\bf_3$C}[]
\qquad\qquad
\sixheterov[bdf]{4s==\raisebox{-1cm}{5}}{2==SO$\bf_3$H;5==H$\bf_3$C}[]