Chemical name: (1R,3r,5S)-3-[(Hydroxydiphenylacetyl)oxy]spiro[8-azoniabicyclo[ 3.2.1]octane-8,1¢- pyrrolidinium] chloride.

Molecular formula: C₂₅H₃₀ClNO₃

Molecular weight: 428.0

Property: White or almost white, crystalline powder. Very soluble in water, freely soluble in methanol, practically insoluble in methylene  chloride.

    Appearance:White or almost white, crystalline powder.

    Appearance of solution:Solution S is clear and not more intensely coloured than reference solution B₇..

    pH :5.0 to 7.0.

    Impurity A: Not More Than 0.3%.

    Impurity B: Not More Than 0.5%.

    Impurity C: Not More Than 0.5%.

    Any other Related compounds:Not More Than 0.1%.

    Total Related Compounds:Not More Than 1.0%.

    Loss on drying: Not more than 0.5%

    Reidue on ignition: Not more than 0.1%

    Assay:99.0% to 101.0% calculated on the anhydrous basis

Use:Treatment of Overactive bladder(OAB).