On Tuesday, 19 May 2020 at 15:49, Timothy wrote: > #+LATEX_HEADER: \usepackage{mhchem} > \ce{CO2} @@latex:\ce{CO2}@@
You probably need to add this to =org-latex-packages-alist= in your emacs configuration: (add-to-list 'org-latex-packages-alist '("version=3" "mhchem")) Also, you might be interested in using the org-fragtog MELPA package. -- : Eric S Fraga via Emacs 28.0.50, Org release_9.3.6-640-g9bc0cc