I am busy to edit an older article in which there are a couple of chemical fromulas and reactions. However, I am stuck because the following throws me an error when uncommenting the line with “\chemical{2H^\oplus}{~waterstof (zuur)}” (something with $ inserted…) Another aspect is, that the {DEZ} does not appear. Further the {zinkion} and {ethan} appear not as text under the formula but as text next to it. \starttext \placeformula \startformula \chemical{(C_2H_5)_2Zn}{DEZ} \chemical{PLUS} % \chemical{2H^\oplus} {waterstof (zuur)} \chemical{GIVES} \chemical{Zn^{2\oplus}}{zinkion} \chemical{PLUS} \chemical{2(C_2H_6)}{ethan} \stopformula \stoptext Thank you for hints, what I am missing here… Kind regards Willi