$\begin{array}{*{20}{c}} {Me} \\ {|\,\,\,\,} \\ {{H_2}C - N - C - Et} \\ {\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,|\,\,} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Me\,\,\,\,\,C{H_2}C{H_3}} \end{array}$