A happy new year to everyone! I’m trying to generate PDF/A compliant files and have a Problem with chemical formulas in text. The following does not work: \setupinteraction [title=TITLE, subtitle=SUBTITLE, author=AUTHOR, keyword={{KEYWORD1, KEYWORD2}, KEYWORD3}] %% For PDF/A \setupbackend[ format={pdf/a-1b:2005}, % or pdf/a-1a:2005 profile={default_cmyk.icc,default_rgb.icc,default_gray.icc}, intent=ISO coated v2 300\letterpercent\space (ECI)] %% Tagged PDF %% method=auto ==> default tags by Adobe \setupbackend[export=yes] \setupstructure[state=start,method=auto] \starttext \chapter[chap:testing]{Testing} Das kann man auch als Textformel darstellen: \chemical{2 H_2,PLUS,O_2,GIVES,2 H_2O}. \input tufte \stoptext If I include the \chemical command inside a \startchemicalformula \stopchemicalformula everything works. What am I missing? Greetings Axel