Tubastatin A HCl is a potent and selective HDAC6 inhibitor with IC50 of 15 nM and is selective(1000-fold more) against all other isozymes except HDAC8(57-fold more).

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.

Droxinostat is an inhibitor of HDAC3, HDAC6, and HDAC8 with IC50 of 16.9, 2.47 and 1.46 μM, respectively.

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.

ACY-1215 is a selective HDAC6 inhibitor with IC50 of 5 nM, being > 10-fold selective for HDAC6 than HDAC1/2/3 (IC50 = 58, 48, and 51 nM) with slight activity against HDAC8, minimal activity against HDAC4/5/7/9/11, Sirtuin1, and Sirtuin2.

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.

Tubacin is a highly potent and selective, reversible, cell-permeable HDAC6 inhibitor with an IC50 of 4 nM in a cell-free assay, approximately 350-fold selectivity over HDAC1.

Tubastatin A is a potent and selective HDAC6 inhibitor with IC50 of 15 nM and is selective(1000-fold more) against all other isozymes except HDAC8(57-fold more).

WT161 selectively inhibits HDAC6 that exhibits effective anti-tumor activities in multiple myeloma.

ACY-738 inhibits HDAC6 with IC50 value of 1.7 nM.

Citarinostat selectively inhibits HDAC6 with IC50 of 4 nM. It can also inhibit HDAC3 (IC50 = 76 nM).

BRD73954 is a selective inhibitor of HDAC6 and HDAC8 with IC50 of 36 nM and 120 nM, respectively.

CAY10603 is a selective inhibitor of HDAC6 with IC50 of 2 pM.

Nexturastat A is a selective inhibitor of HDAC6 with IC50 of 5 nM.

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

Resminostat is a potent inhibitor of HDAC1/3/6 (IC50=43-72 nM) and less potent to HDAC8 with IC50 of 877 nM.