chemtex – Structural chemistry
The package was a very early demonstration of the use of TeX for graphical purposes; it is seldom if ever used now (21st century), but represented ground-breaking effort when first released.
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Maybe you are interested in the following packages as well.
- chemsym: Macros for typing chemical symbols
- modiagram: Drawing molecular orbital diagrams
- chemarr: Arrows for chemists
- bpchem: Typeset chemical names, formulae, etc