(1R,3r,5S,8r)-8-Isopropyl-3-((3-methoxy-2-phenylpropanoyl)oxy)-8-methyl-8-azabicyclo[3.2.1]octan-8-ium Methyl Sulfate is an intermediate in the synthesis of Ipratropium Bromide (Impurity-1) (I740515), which is a free form of Ipratropium Bromide Monohydrate (I740500), a nonselective muscarinic acetylcholine receptor antagonist; bronchodilator.