Chemical Animation - Animated GIFs - the GIF89a standard

Animated GIFs are standard GIF89a files with multiple images and timing information.

Here is an another example:

Using Oxford Molecular's CAChe an orbital animation of an Diels Alder reaction was produced, I then imported this into GifBuilder . Then saved as animation GIF, 211K in total size.

Pretty and would be very hard to illustrate in any other way.