For quite a while now there has been a question on {TeX}.SE about how to modify the ratio of the two harpoons indicating an equilibrium reaction. There is also a nice solution (by Matthew Leingang) to the problem using mhchem. Since the question predates the chemformula part of chemmacros the following solution couldn’t yet have been provided:


\ch{CH2OH + ATP <=>>[Hexokinase] "glucose~6-phosphate" + ADP + H+}

\ch[arrow-ratio=.2]{CH2OH + ATP <=>>[Hexokinase] "glucose~6-phosphate" + ADP + H+}

Note: The quotation marks around "glucose~6-phosphate" prevent it from being treated as a formula.

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