A camsylate salt of (1r,1 'R,4R)- 4-methoxy-5"-methyl-6'-[5-(prop-1-yn-1-yl)pyridin-3-yl]-3'H-dispiro[cyclohexane-1,2'-inden-1'2'-imidazole]-4"-amine, pharmaceutical compositions containing the salt and therapeutic uses of the salt for treating ?ß-related pathologies such as Alzheimer's Disease, Down's syndrome, ß-amyloid angiopathy and conditions such as dementia including dementia of mixed vascular and degenerative origin, pre-senile dementia, senile dementia and dementia associated with Parkinson's disease, progressive supranuclear palsy or cortical basal degeneration.
