# Histidine Chemfig from a Picture

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}


A solution with chemmove

\documentclass{article}
\usepackage{chemfig}
\usetikzlibrary{calc}

\begin{document}

\chemfig{NH(-[4]@{a})(-[:165,0.22,,,draw=none]^{+})
=[:60,,1]-[:120,,,1]NH-[4]@{b}-[2]CH_2
-[2]C(-[2]H)(-[4,0.9]H_3N^{+}|\vphantom{C})
-[0]C(=[1]O)
-[-1]O|^{-}}
\chemmove[-]{
\draw (a) -- (b);
\draw ($(a)+(2pt,2pt)$) -- ($(b)+(2pt,-2pt)$);
}

\end{document}