Empagliflozin Dimer Impurity

Empagliflozin Dimer Impurity arises from the head-to-tail coupling of two Empagliflozin molecules via a glycosidic linkage between the 4-hydroxyl group of one benzodioxole ring and the 6-hydroxyl of another, forming a bis-(benzodioxole) scaffold with retained pyranose core stereochemistry. This dimer exhibits enhanced hydrophobicity compared to the parent SGLT2 inhibitor, with intermolecular hydrogen bonding between the dimerized hydroxyls and residual carbonyl moieties. Synthetically, it serves as an HPLC reference standard for quantifying dimerization byproducts in Empagliflozin API batches.