Jmol resource type
From MoodleDocs
Jmol is open-source Java software for interactive 3D viewing of molecular structures. It can easily be embedded into a webpage... including a Moodle page.
The Moodle Jmol resource module extension is easy to install.
For ultimate flexibility you may also wish to install the Jmol filter.
It requires no additional capability on your web server, but is a Java applet, added to the page with JavaScript controls, so requires both Java and a JavaScript-enabled browser for the user.