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.



A solution with chemmove



    \draw (a) -- (b);
    \draw ($(a)+(2pt,2pt)$) -- ($(b)+(2pt,-2pt)$);


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