XyMTeX is a set of packages for drawing a wide variety of chemical structural formulas. The commands have a set of systematic arguments for specifying substituents and their positions, endocyclic double bonds, and bond patterns; in some cases there are additional arguments for the hetero-atoms on the vertices of heterocycles. It is believed that this systematic design allows XyMTeX to operate as a practical (device-independent) tool for use with LaTeX.

XyMTeX is reported not to be an easy environment to work in, be contrast to the chemfig package (which supports a significant proportion of XyMTeX functionality).

(Note: while XyMTeX was once uploaded to CTAN, it appears that the author only updates it on the web, and the CTAN team has been unable to track it; in default of a further upload, we shall leave our copy of the package in the ‘obsolete’ area of the archive.

The author is Shinsaku Fujita. The package is Copyright © 1993-2005,2009 Shinsaku Fujita.