gamma-secretase modulator 2 is a potent and selective γ-secretase modulator for treatment of Alzheimer's disease .γ-secretase modulator is modulation of the action of γ-secretase so as to Selectively attenuate production of Aβ(1-42) and hence find use in treatment or prevention of diseases associated with deposition of Aβ in the brain. γ-secretase modulator is usful in particular Alzheimer's disease.