Provided herein is an impurity of fesoterodine, fesoterodine dehydroxy impurity, 2-[(1R)-3-[bis(1-methylethy)amino]-1-phenylpropyl]-4-methylphenyl isobutyrate, and a process for preparing and isolating thereof. Provided further herein is a highly pure fesoterodine or a pharmaceutically acceptable salt thereof substantially free of fesoterodine dehydroxy impurity, process for the preparation thereof, and pharmaceutical compositions comprising highly pure fesoterodine or a pharmaceutically acceptable salt thereof substantially free of dehydroxy impurity. Provided also herein is a pharmaceutical composition comprising solid particles of pure fesoterodine fumarate substantially free of dehydroxy impurity, wherein 90 volume-percent of the particles (D90) have a size of less than about 200 microns.
本文提供了费索特罗定的杂质,费索特罗定脱羟杂质,2-[(1R)-3-[双(1-甲基乙基)
氨基]-1-苯基丙基]-4-甲基苯基
异丁酸酯的过程及其分离方法。此外,本文还提供了高纯度的费索特罗定或其药学上可接受的盐,基本上没有费索特罗定脱羟杂质,其制备过程以及包括高纯度费索特罗定或其药学上可接受的盐基本上不含脱羟杂质的制药组合物。本文还提供了一种制药组合物,其中包括基本上不含脱羟杂质的纯费索特罗定
富马酸盐固体颗粒,其中90体积百分比的颗粒(D90)尺寸小于约200微米。