*** 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    

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