Pioglitazone N-Oxide

Pioglitazone N-Oxide is a structurally modified derivative of the antidiabetic drug Pioglitazone, featuring an oxidized nitrogen atom at the pyridine ring's 4-position. This oxidation introduces an N-O bond, increasing the compound's polarity and altering its electronic properties relative to the parent molecule. The core structure retains the thiazolidinedione ring fused to a benzene ring substituted with a methyl group and a pyridine moiety. As a degradation byproduct under oxidative stress conditions, it serves as a critical HPLC reference standard for quantifying impurities in Pioglitazone formulations.