Patent ID: 8742134

Claim:
A stereochemically pure compound salt with a stereochemical purity of at least 80% selected from the group consisting of: (1S,2R)-2-((R)-2′-cyclopentyl-2′-hydroxy-2′-phenylacetoxy)-7,7-dimethyl-7-azoniabicyclo[2.2.1]heptane with anion x ⊖ ; (1R,2S)-2-((R)-2′-cyclopentyl-2′-hydroxy-2′-phenylacetoxy)-7,7-dimethyl-7-azoniabicyclo[2.2.1]heptane with anion x ⊖ ; (1R,2R)-2-((R)-2′-cyclopentyl-2′-hydroxy-2′-phenylacetoxy)-7,7-dimethyl-7-azoniabicyclo[2.2.1]heptane with anion x ⊖ ; and (1S,2S)-2-((R)-2′-cyclopentyl-2′-hydroxy-2′-phenylacetoxy)-7,7-dimethyl-7-azoniabicyclo[2.2.1]heptane with anion x ⊖ ; wherein anion x ⊖ is a pharmaceutically acceptable anion.