Chemfig is a LaTeX package used for creating graphical representations of chemical structures, molecules, reaction schemes, and structural formulas. It provides a simple and flexible syntax to define atoms, bonds, angles, rings. It allows for the construction of both organic and inorganic molecules using LaTeX markup.
Syntax.
Package preamble:
\input chemfig.tex
Chemfig uses a simple syntax based on TeX commands. For example:
Produces a structural formula for acetic acid and a structure would render as:
There are 9 different bond types:
\chemfig{A-B}\\
\chemfig{A=B}\\
\chemfig{A~B}\\
\chemfig{A&gt;B}\\
\chemfig{A&lt;B}\\
\chemfig{A&gt;:B}\\
\chemfig{A&lt;:B}\\
\chemfig{A&gt;|B}\\
\chemfig{A&lt;|B}\\ 
Molecular angles of a methane molecule: &lt;br&gt;