Chemical name:
(1R,3r,5S)-3-[(Hydroxydiphenylacetyl)oxy]spiro[8-azoniabicyclo[ 3.2.1]octane-8,1¢- pyrrolidinium] chloride.
CAS: 10405-02-4
Structural formula:

Molecular formula: C₂₅H₃₀ClNO₃
Molecular weight: 428.0
Specification: Standard EP7
Appearance: White or almost white, crystalline powder.
pH: 5.0 to 7.0.
Related Substances:
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 0.10%.
Total Related Compounds: Not More Than 1.0%.
Loss on drying: Not more than 0.5%
Residue on ignition: Not more than 0.1%
Assay: 99.0% to 101.0% calculated on the dried basis
Application: An anticholinergic medicine, used for curing overactive bladder, like uroclepsia, urgency of micturition, frequency of micturition