2,3-diphosphoglycerate

[dī-fŏs′fō-glĭsə-rāt′]
n.
  1. An isomer of 1,3-diphosphoglycerate that occurs in red blood cells and is essential to the normal functioning of hemoglobin.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.