Ascorbic Acid (Vitamin C)

Molecular model of ascorbic acid, also know as vitamin C, in ball and stick form.
"Vitamin C or L-ascorbic acid, or simply ascorbate (the anion of ascorbic acid), is an essential nutrient for humans and certain other animal species."
--http://en.wikipedia.org/wiki/Vitamin_C
Model created using VMD:
http://www.ks.uiuc.edu/Research/vmd/