Cfrgtkky

Hello I need help drawing/typesetting an acid base reaction showing the conjugate pairs:

Here is what I have so far:

documentclass{article}

usepackage{chemfig}

usepackage{endiagram}

usepackage{booktabs}

begin{document}

setchemfig{cram width=3pt}

schemestart

chemname{chemfig{H_{3}C-C(=[:45]O)-[:-45]O-[:0]H}}{Acetic Acid}

+

chemname{chemfig{H_{3}C-Lewis{2:,N}(<:[:-15]H)<[:-40]H}}{Methylamine}

arrow{<=>}

chemname{chemfig{H_{3}C-C(=[:45]O)-[:-45]Orlap{${}^-$}}}{Acetate Ion}

+

chemname{chemfig{H_{3}C-Nrlap{${}^+$}(-[:45]H)(<:[:-15]H)<[:-40]H}}{Mathylammonium Ion}

schemestop

end{document}

Which produces the reaction and the lewis structures I am interested in. I do not need the colours nor the dots around the oxygen atoms, I only require assistance with the bottom section of the figure. My code currently produces this:

I know it might be possible to use tikz[overlay,remember picture]{}, but I do not know how to label the text below the chemicals.

Something like this?

documentclass{article}

usepackage{chemfig}

usepackage{endiagram}

usepackage{booktabs}

usetikzlibrary{tikzmark,positioning,shapes.geometric}

definecolor{dullblue}{RGB}{178,201,231}

begin{document}

setchemfig{cram width=3pt}

schemestart

chemname{chemfig{H_{3}C-C(=[:45]O)-[:-45]O-[:0]H}}{tikzmarknode{A}{Acetic

Acid}}

+

chemname{chemfig{H_{3}C-Lewis{2:,N}(<:[:-15]H)<[:-40]H}}{tikzmarknode{B}{Methylamine}}

arrow{<=>}

chemname{chemfig{H_{3}C-C(=[:45]O)-[:-45]Orlap{${}^-$}}}{tikzmarknode{C}{Acetate

Ion}}

+

chemname{chemfig{H_{3}C-Nrlap{${}^+$}(-[:45]H)(<:[:-15]H)<[:-40]H}}{tikzmarknode{D}{Mathylammonium

Ion}}

schemestop

begin{tikzpicture}[overlay,remember picture]

node[below=3mm of A,fill=dullblue,draw,ellipse] (Acid1) {Acid};

node[below=3mm of B,draw,ellipse] (Base1) {Base};

node[below=3mm of C,fill=dullblue,draw,ellipse] (Base2) {Base};

node[below=3mm of D,draw,ellipse] (Acid2) {Acid};

draw[blue!50] (Acid1) -- ++ (0,-1.5) coordinate(aux) -| (Base2);

draw (Base1) -- ++ (0,-2)  -| (Acid2);

node[anchor=south,blue!50,fill=white,outer sep=1pt] at (aux-|Base1) {Conjugate pair};

end{tikzpicture}

end{document}