Orally active class I histone deacetylase (HDAC) inhibitor (Ki values are 0.41, 0.75, >100 and >100 μM for HDAC1, HDAC3, HDAC6 and HDAC8 respectively). Mediates G1 cell cycle arrest, inhibits proliferation and induces apoptosis in vitro and in vivo. Increases neuroplasticity during memory extinction. Also increases efficiency of hepatic differentiation of hPSCs. Purity 99%. MW (observed): 269.3