5-Desethyl 5-Carboxy Pioglitazone is an an anti-diabetic, and a metabolite of Pioglitazone.
Krieter, P., et al.: Drug Metab. Dispos., 22, 625 (1994), Tanis, S., et al.: J. Med. Chem., 39, 5053 (1996), Chilcott, J., et al.: Clin. Ther., 23, 1792 (2001),