Inhibitor of γ-secretase; causes a reduction in Aβ40 and Aβ42 levels in human primary neuronal cultures (IC50 values are 115 and 200 nM for total Aβ and Aβ42 respectively) and in brain extract, cerebrospinal fluid and plasma in vivo. Does not affect APPα and APPβ levels. Blocks Notch signaling in hybrid human-mouse fetal thymus organ culture (FTOC). Activity causes ESCs to commit to neuronal differentiation. DAPT synthesized to cGMP guidelines also available.. Purity 99%. MW (observed): 432.46