I want side arrows coming in and out of the reaction, a ubiquitous convention in biochemistry yet astonishingly not supported by packages like mhchem.
mychemistry supports it (see p26 of package manual in the link for examples). Alas mychemistry.sty is not available to me on QuickLatex because of its recency. How can I do this without the aid of mychemistry and without extreme hacking and modifying source code? I'm not a programmer, and I know nothing about Tex.
I also don't know how to use picture packages like Tikz. So unless it involves a simple invocation of pre-defined commands, I prefer to avoid it.