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. Author manuscript; available in PMC: 2010 Jun 15.
Published in final edited form as: Free Radic Biol Med. 2009 Mar 27;46(12):1626–1632. doi: 10.1016/j.freeradbiomed.2009.03.017

Figure 1. General structure of corrins/cobalamins.

Figure 1

The figure demonstrates various upper axial ligands, the corrin ring, and a lower axial ligand. Hydroxocobalamin has a hydroxyl group at the R position. Cyanocobalamin has a cyano group at the R position. Methylcobalamin and adenosylcobalamin have a methyl and adenosyl group, respectively, at the R position. Cobinamide lacks the lower axial ligand and has a hydroxyl group at the R position. Dicyanocobinamide has a cyano group as the lower axial ligand and at the R position.