Wiktionary
semagacestat
n. A drug designed to treat Alzheimer's disease but never marketed.
Wikipedia
Semagacestat
Semagacestat (LY450139) was a candidate drug for a causal therapy against Alzheimer's disease. It was originally developed by Eli Lilly and Élan, and clinical trials were conducted by Eli Lilly. Phase III trials included over 3000 patients, but in August 2010, a disappointing interim analysis, in which semagacestat performed worse than the placebo, led to the trials being stopped.