tiotropium bromide and its Impurities
A muscarinic receptor antagonist, used in the treatment of chronic obstructive pulmonary disease (COPD). A long acting anticholinergic bronchodilator .Reference standards of Tiotropium Bromide API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.


α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester
α-Hydroxy-α-3-thienyl-2-thiopheneacetic Acid 9-Methyl-3-oxa-9-azatricyclo[3.3.1.02,4]non-7-yl Ester
Catalogue No.:PA 20 0661014
CAS :
783273-13-2
Molecular Formula : C18H19NO4S2
Molecular Weight : 377.47

![rel-(1R,3r,5S)-8-Methyl-8-azabicyclo[3.2.1]oct-6-e PA 20 0661015](https://www.pharmaffiliates.com/pimages/PA200661015.jpg)
rel-(1R,3r,5S)-8-Methyl-8-azabicyclo[3.2.1]oct-6-en-3-yl 2-hydroxy-2,2-di(thiophen-2-yl)acetate
rel-(1R,3r,5S)-8-Methyl-8-azabicyclo[3.2.1]oct-6-en-3-yl 2-hydroxy-2,2-di(thiophen-2-yl)acetate
Catalogue No.:PA 20 0661015
CAS :
736108-96-6
Molecular Formula : C18H19NO3S2
Molecular Weight : 361.47