Active Motif's Potent and selective histone deacetylase 6 (HDAC 6) inhibitor (IC50 = 15 nm; >1000-fold selective against other HDACs and 60-fold for HDAC8)). Inhibits TNF_ (IC50 = 272 nm) and IL-6 (IC50 = 712 nm) in LPS-stimulated human macrophages and displays anti-inflammatory activity in animal models. Improves survival in animal models of sepsis. Improves cognition in Alzheimers disease transgenic mice. It is cell permeable.