Atmoxitine S isomer

Atmoxitine S isomer is the enantiomerically pure S-configured stereoisomer of the antihypertensive agent Atmoxitine, characterized by a chiral center at the 3-position of its 3-(dimethylamino)propyl side chain. This impurity features a 4-chloro-substituted benzene ring linked to a tertiary amine, differing from the parent compound solely by its opposite stereochemistry. Synthetically derived as a minor byproduct during asymmetric synthesis or racemic resolution processes, it exhibits distinct chromatographic and spectroscopic properties. It serves as an HPLC reference standard for enantiomeric purity assessment in Atmoxitine API manufacturing.