CUDC-101 inhibits HDAC, EGFR and HER2 with IC50 of 4.4 nM, 2.4 nM and 15.7 nM, respectively.

Pracinostat is a potent pan-HDAC inhibitor with IC50 of 40-140 nM with exception for HDAC6 and has no activity against the class III isoenzyme SIRT I.

PCI-24781 is a pan-HDAC inhibitor mostly targeting HDAC1 with Ki of 7 nM, modest potent to HDACs 2, 3, 6, and 10 and greater than 40-fold selectivity against HDAC8.

CUDC-907 is a dual PI3K and HDAC inhibitor for PI3Kα and HDAC1/2/3/10 with IC50 of 19 nM and 1.7 nM/5 nM/1.8 nM/2.8 nM, respectively.

Tucidinostat is an inhibitor of HDAC enzymes class I (HDAC1/2/3) and class IIb (HDAC10) inhibitor with IC50s of 95, 160, 67 and 78 nM, espectively.

Domatinostat is a selective class I HDAC inhibitor with IC50 of 1.20 μM, 1.12 μM, and 0.57 μM for HDAC1, HDAC2, and HDAC3, respectively. Also displays inhibitory activity against Lysine specific demethylase 1 (LSD1).

HPOB is a selective inhibitor of HDAC6 with IC50 of 56 nM.

Quisinostat 2HCl is a second-generation HDAC inhibitor with highest potency for HDAC1 with IC50 of 0.11 nM in a cell-free assay, modest potent to HDACs 2, 4, 10, and 11, greater than 30-fold selectivity against HDACs 3, 5, 8, and 9 and lowest potency to HDACs 6 and 7.