*** QuickLaTeX cannot compile formula:



\chemname{\chemfig{R-C(-[:-30]OH)=[:30]O}}{Carboxylic\\acid}
\chemsign{+}
\chemname{\chemfig{R'OH}}{Alcohol}
\chemrel{->}
\chemname{\chemfig{R-C(-[:-30]OR')=[:30]O}}{Ester}
\chemsign{+}
\chemname{\chemfig{H_2O}}{Water}
\chemnameinit{}


*** Error message:
Undefined control sequence \chemsign.
leading text: \chemsign

     \begin{align*} \ce{A + B &-> D} \\ \ce{C + F &-> X + Y} \end{align*}


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