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. Author manuscript; available in PMC: 2010 Oct 15.
Published in final edited form as: Free Radic Biol Med. 2009 Jul 17;47(8):1147–1153. doi: 10.1016/j.freeradbiomed.2009.07.019

Figure 1a.

Figure 1a

The structures of alpha-lipoic acid (LA) and the reduced form dihydrolipoic acid (DHLA) are shown. The asterisks demonstrate the site of the stable isotope 13C labels in the molecule.