pitavastatin 4,6-di

Pitavastatin 4,6-di is an oxidized diol impurity derived from the parent statin pitavastatin, featuring hydroxyl groups at the C-4 and C-6 positions of the pyrroline core. This structural modification introduces vicinal diol functionality, enhancing polarity relative to the lactone-containing parent compound. The diol arises via oxidative degradation of the pyrrole ring under alkaline conditions, disrupting the conjugated system critical for HMG-CoA reductase inhibition. This impurity serves as a reference standard for HPLC-based quantification of oxidation-related degradation products in pitavastatin formulations.