$(x)\begin{array}{*{20}{c}} {O\,\,\,}\\ {||\,\,\,}\\ {C{H_3} - S - O - H}\\ {||\,\,\,\,}\\ {O\,\,\,\,} \end{array}$
$\begin{array}{*{20}{c}} {\,\,\,\,\,O}\\ {\,\,\,\,\,\,||}\\ {(y)\,\,\,C{H_3} - C - O - H} \end{array}$
$(z)\,\, CH_3 -OH$