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Semagacestat (also known as LY450139), [(2S)-2-hydroxy-N-((2S)-1-((1S)-3-methyl-2-oxo-2,3,4,5-tetrahydro-1H-benzo[d]azepin-1ylamino)-1-oxopropan-2-yl)-3-methylbutanamide] is an azepine class γ-secretase, which is currently being investigated as a potential disease-modifying agent for the treatment of Alzheimer’s disease (AD). It reduces the rate of formation of amyloid-β (Aβ), a major component of the neuritic plaque in the brains of AD patients, in human subjects and animal models including mice, beagle dogs and guinea pigs. According to previous studies, semagacestat slows the accumulation of Aβ in the brains of transgenic mice overexpressing mutant human amyloid precursor protein V717F (PDAPP mice) and exhibits a dose-dependent decrease of plasma in AD patients.

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