MW: 358.48 Da CAS Registry #: 929016-96-6 Formula: C₂₀H₃₀N₄O₂ Target: HDAC Background:Pracinostat (SB939) is an orally bioavailable, small-molecule histone deacetylase (HDAC) inhibitor with potential antineoplastic activity. Pracinostat inhibits HDACs, which may result in the accumulation of highly acetylated histones. It is a pan-HDAC inhibitor, inhibiting all HDAC isozymes except HDAC6 and HDAC7. Description:Potent and oral inhibitor of histone deacetylase (HDAC), selective for class I, II and IV HDACs. SB939 shows significant antiproliferative activity against a wide variety of tumor cell lines, with high tumor exposure and efficacy in mouse models of colorectal cancer. Synonym(s): SB-939; SB 939; (E)-3-[2-butyl-1-[2-(diethylamino)ethyl]benzimidazol-5-yl]-N-hydroxyprop-2-enamide Biological Activity: SB 939 is an HDAC inhibitor that inhibits HDAC1 (IC50 = 49 nM), HDAC3 (IC50 = 43 nM), HDAC4 (IC50 = 56nM), HDAC5 (IC50 = 47 nM), HDAC9 (IC50 = 70 nM), HDAC10 (IC50 = 40 nM). Only poorly inhibits HDACs 6 or 7 (Kis = 247 and 104 nM, respectively). Prevents proliferation of ovarian (A2780), colon (COLO 205 and HCT-116), and prostate cancer (PC-3) cell lines at IC50 values of 0.48, 0.56, 0.48, and 0.34 µM, respectively. Solubility: Soluble in DMSO Storage / Stability:

Store at or below –20°C. Solid form is stable at least 12 months from date of receipt, when stored as directed. Do not store aqueous solutions for more than one day.

Reference(s): 1. Novotny-Diermayr V, et al. Mol Cancer Ther. 2010 Mar;9(3):642-52. 2. Wang, H., et al. 2011. J. Med. Chem. 54(17): 4694-4720. 3. Novotny-Diermayr V, et al. Blood Cancer J. 2012 May;2(5):e69. Scientific Category: Deacetylase Inhibitor Product Type: Inhibitor Data shown is lot-specific. Contact us for specific information on other lots.