## Description

This example uses vtkCMLMoleculeReader to read a [Chemistry Markup Language](http://www.xml-cml.org/) file. CML has been developed by Peter Murray-Rust and Henry Rzepa since 1995. It is the de facto XML for chemistry, accepted by publishers and with more than 1 million lines of Open Source code supporting it.

!!! info
    This example uses the file porphyrin.cml. A description of the molecule Porphyrin is described [here](https://en.wikipedia.org/wiki/Porphyrin).