The last one from this picture set. I have this Histidine which I have already done a series of questions. I did what I knew this time: I need help to finish the triangle that is in the histidine. Also if I were to publish these notecards would that be possible? I could do it some where, if you kept up with the questions.
\begin{flashcard}
{
\chemfig{H_3N^{+}-C(-[2]H)(-[6]CH_2(trianglething))-C(=[1]O)(-[7]O^-)}
}
Done
\end{flashcard}