$\begin{align}
   \begin{matrix}
   C{{H}_{3}}-CH-C{{O}_{2}}H  \\
   |\,\,\,\,\,\,\,\,  \\
   \underset{\oplus }{\mathop{N}}{{H}_{3}}  \\
\end{matrix}\,\,\,\,\,\,p{{K}_{a}}=2.2 \\ 
  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,p{{K}_{b}}=4.4 \\ 
\end{align}$