(S)-2,2-Diphenyl-2(3-pyrrolidinyl)acetonitrile hydrobromide

It acts as a chiral building block that is converted, often via hydrolysis, into the amide functional group present in the final product. (S)-2,2-Diphenyl-2-(3-pyrrolidinyl)acetonitrile hydrobromide is a key intermediate in the synthesis of Darifenacin, a potent M3 muscarinic receptor antagonist used to treat overactive bladder.