A PURIFICATION PROCESS FOR PREPARING HIGHLY PURE ARFORMOTEROL TARTRATE SUBSTANTIALLY FREE OF DESFORMYL IMPURITY

摘要

Provided herein is a highly pure arformoterol tartrate or an amorphous form thereof substantially free of desformyl impurity, 2-hydroxy-5-[(lR)-l-hydroxy-2-[[(lR)-2-(4-methoxyphenyl)-l-methylethyl]amino]ethyl]aniline, process for the preparation thereof, and pharmaceutical compositions comprising the highly pure arformoterol tartrate substantially free of the desformyl impurity.