Thyromimetic; high affinity agonist at thyroid hormone receptor (TR) β and TRα receptors (KD values are 67 and 440 pM respectively). Displays 5- and 100-fold greater potency than the endogenous agonist T3 in vitro at TRα1 and TRβ1 receptors respectively. Promotes reverse cholesterol transport in chow- and fat-fed mice. Induces proliferation of hepatocytes and pancreatic acinar cells in rats independent of prior tissue injury. Purity 98%. MW (observed): 328.4