Mirtazapine EP Impurity F

Mirtazapine EP Impurity F is a structurally related degradation byproduct of the antidepressant mirtazapine, characterized by a substituted thiazole ring system with a piperazine side chain and a methoxyphenyl moiety. The compound features a secondary amine, an amide linkage, and aromatic heterocycles, differing from the parent drug by a methylene bridge oxidation to a hydroxyl group. This impurity arises via oxidative degradation under acidic conditions. It serves as an HPLC reference standard for quantifying process-related impurities in mirtazapine active pharmaceutical ingredients.