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ConTeXt comes always came with the extensive chemistry module PPCHTeX which allows the support including drawing of chemical structures and the typesetting of reactions.

In MkII this was called PPCHTeX , which works also with plainTeX, plain TeX and LaTeX and - of cause - with ConTeXt.

* [http://wwwThere doesn’t seem to be any current documentation (all previous links were long dead), while chemistry support is still part of the distribution, but currently broken.pragma(2023-ade.com/ppchtex10-01: part of the math upgrade, please wait until it becomes stable.htm PPCHTeX (general)] by Pragma* There are a few working examples in the [[httpmanual://www.pragmamkiv-adepublications.com/document.htm PPCHTeX documenatationpdf|publications] by Pragma* [http://www.ntg.nl/mailman/listinfo/ntg-ppchtex PPCHTeX mailing list]* [http://wwwmanual (chapter 10.ntg2), i.nl/pipermail/ntg-ppchtex/ PPCHTeX mailing list archive] Some other PPCHTeX links:* [http://mitgliede.lycos.de/ppchtex/00index.html PPCHTeX structure database]* in the file [httphttps://wwwsource.mitcontextgarden.edu/afs/athena/contrib/tex-contrib/Chem2/ppchtexnet/doc/fh-ch-en.htm PPCHTeX FAQ] and [http:context//www.pragma-ade.comsources/general/faqsmanuals/ PPCHTeX FAQ in PDF](rather old)* [http:publications//wwwC6H6O.tug.org/TUGboat/Articles/tb17-1/tb50hagebib C6H6O.pdf TUG Boat article on PPCHTeXbib] by Hans Hagen and A.F Otten

* [[manual:xchemml-p.pdf|ChemML]] ([[manual:xchemml-s.pdf|screen]]), [[MathML]] extension for chemistry. == Using {{cmd|chemical}} == This is the built-in version of the previous `chemic` module. <context source="yes"> \chemical{HSO_4^{-}}</context> You can also typeset chemical ''reactions'': <context source="yes"> \startformula \chemical{2H_2,+,O_2,->,2H_2O}\stopformula</context> == Chemical structures == (The “good” images are old; the broken ones are the result of the current code.) <context source="yes"> \startchemical \chemical[FIVE,FRONT,BB125,+SB3,-SB4,Z4][O] \chemical[FIVE,FRONT,+R1235,+RZ1235][H,H,\SR{HOH_2C},OH] \chemical[FIVE,FRONT,-R1235,-RZ1235][H,OH,H,H]\stopchemical</context> [[Image:Chemistry_example1.png]] <context source="yes"> \setupchemical[width=fit] \startchemical \chemical[SIX,B,C,MOV2,B,C,R234,RZ234,MOV5,MOV6,B,C,R561,RZ561] [R,R,R,R,R,R]\stopchemical</context> [[Image:chemistry_example2.png]] To draw this structure horizontally:<context source="yes"> \setupchemical[width=fit] \def\RotR{\rotate[rotation=270]{\ix R}} \rotate[rotation=90]{\startchemical \chemical[SIX,B,C,MOV2,B,C,R234,RZ234,MOV5,MOV6,B,C,R561,RZ561] [\RotR,\RotR,\RotR,\RotR,\RotR,\RotR]\stopchemical}</context> [[Image:chemistry_example3.png]] An example of an amino acid: Histidine (Ace-His-Nme).The rest of the amino acids are shown in [http://wwwtt4sci.pragma-adewordpress.com/general2009/manuals08/xchemml05/drawing-organic-molecules-in-latex-ii-amino-acids/ TT4Sci]<context source="yes"> \definechemical[radical]{\chemical[SAVE,ONE,SB768,Z068][C,H,H]\chemical[MOV7,ONE,Z0][C]\chemical[MOV7,FIVE,ROT4,SB12345,EB42,Z1235,SR125,RZ125,RESTORE][N,C,N,C,H,H,H]}\startchemical[scale=big,size=big,left=2600,right=4200,bottom=2800,top=4500]\bottext{Histidine}\chemical[SIX,SB23]\chemical[PB:Z1,SAVE,radical,RESTORE,PE]\chemical[PB:Z2,ONE,SB37,Z03,PE][\SL{C^{\alpha}},H^{\alpha 1}]\chemical[PB:Z3,SIX,Z5,SB4,Z4,PE][N,H]{\color{blue}\chemical[PB:Z4,SIX,Z2,SB2,DB1,Z31,PE][C{\text{\tiny{-1}}},\SR{H_3C},O{\text{\tiny{-1}}}]}\chemical[SIX,MOV1,SB23]\chemical[PB:Z3,SIX,Z5,DB4,Z4,PE][C,O]{\color{red}\chemical[PB:Z2,SIX,Z4,SB34,Z53,PE][N{\text{\tiny{+1}}},H{\text{\tiny{+1}}},\SL{CH_3}]}\stopchemical</context> [[Image:histidine.png]]  == Simple Formulae in Text Mode == An alternative to using the chemistry module or mathmode for typesetting simple formulae are the ConTeXt commands {{cmd|high}}, {{cmd|low}}, {{cmd|lohi}}, and {{cmd|himilo}}. This might be useful if you want to typset the formula with the same font as the surrounding text (in titles or slanted fonts, although that might not be desired in all situations). <context source="yes"> \ss H\low{2}O also consists of H\high{+} and OH\high{--p}.\crlfThere are two main carbon isotopes: \lohi{6}{12}C and \lohi[left]{6}{13}C.</context> Taco’s macros implement this approach [http://archive.contextgarden.net/thread/20060702.084423.a201a280.en.pdf ChemMLhtml]: '''This is broken code from 2006!''' <context source="yes"> \newbox\chemlowbox\def\chemlow#1% {\setbox\chemlowbox\hbox{{\switchtobodyfont[small]#1}}} \def\chemhigh#1% {\ifvoid\chemlowbox \high{{\switchtobodyfont[small]#1}}% \else \/\lohi{\box\chemlowbox}{{\switchtobodyfont[small] #1}}\fi } \def\finishchem% {\ifvoid\chemlowbox \else \iffluor \fluorfalse \kern-.1em \fi\low{\box\chemlowbox}\fi} % for "kerning" after F\newif\iffluor \unexpanded\def\molecule% {\bgroup \catcode`\_=\active \uccode`\~=`\_ \uppercase{\let~\chemlow}% \catcode`\^=\active \uccode`\~=`\^ \uppercase{\let~\chemhigh}% \dostepwiserecurse {65}{90}{1} {\catcode \recurselevel = \active \uccode`\~=\recurselevel \uppercase{\edef~{\noexpand\finishchem \rawcharacter{\recurselevel}}}}% \uccode `\~=`\F \uppercase{\def~{\finishchem F\fluortrue}}% \catcode`\-=\active \uccode`\~=`\- \uppercase{\def~{--}}% \loggingall \domolecule }% \def\domolecule#1% {\expandafter\scantokens\expandafter {\detokenize{#1\finishchem}}\egroup} \bs Bold slanted molecules: \molecule{HSO_4^-} and \molecule{SF_6}</context> The main difference with the built-in chemistry is that the <code>\molecule</code> from this example uses the same font as the one in surrounding text, while the official module always uses the (mostly roman) math font (which is probably the proper way if you’re writing dozens of formulas). Alternatively you can setup the <code>style</code> parameter used for chemical formulas manually: <texcode>\setupchemical[style=\bs]</texcode> == Old Links == * [http://www.pragmamit.edu/afs/athena/contrib/tex-contrib/Chem2/ppchtex/doc/fh-ch-adeen.comhtm PPCHTeX FAQ] (1997)* [http://www.tug.org/generalTUGboat/manualsArticles/xchemmltb17-s1/tb50hage.pdf screenTUG Boat article on PPCHTeX] by Hans Hagen and A.F. Otten 1996  [[Category:Sciences]]), MathML extension for chemistry