# vertical reaction arrow pointing to one horizontal reaction arrow in chemfig

I'm having trouble writing the arrows below, can someone help me?

• Problem solved? Apr 24 at 16:06
• Yes, thank you for the answers. Apr 24 at 20:50
• Then please consider accepting one of the answers. This is the "normal" procedure here in order to "close" a question. Apr 24 at 21:05

A suggestion in chemfig without subscheme:

\documentclass{article}

\usepackage{chemfig}
\begin{document}

\schemestart
\chemfig{H_2O}
\+
\chemfig{HCO^{+}}
\arrow(--[xshift=-33pt,yshift=25pt]){->[*{0}\chemfig{H_3O^{+}}]}[-90]
\chemfig{HCR=[90,,2]O}
\arrow(.mid east--.mid west){<->>}
\chemfig{RCH_2-[-90,,2]Y}
\schemestop
\end{document}


• I have not seen your very nice answer. +1 Apr 9 at 22:22

I found a way to do this, using subschemes. The vertical arrow leaves the middle of the upper subscheme and points to the middle of the lower subscheme.

\schemestart

\chemfig{A}

\+

\chemfig{B}

\arrow{->}

\chemleft[

\subscheme{

\chemfig{C}

\arrow{<->}

\chemfig{D}

}

\chemright]

\arrow{->[*{0}\chemfig{H_3O^{+}}]}[-90,1.2]

\subscheme{

\chemfig{E}

\arrow{<<->}[0,1.2]

\chemfig{F}

}

\schemestop



The result is: