Romidepsin strongly inhibits HDAC1 and HDAC2 with IC50 of 1.6 nM and 3.9 nM, respectively, but is relatively weak in inhibiting HDAC4 and HDAC6 with IC50 25 nM and 790 nM, respectively.

Rocilinostat (ACY-1215) is a selective HDAC6 inhibitor with IC50 of 5 nM; >10-fold more selective for HDAC6 than HDAC1/2/3 (class I HDACs) with slight activity against HDAC8, minimal activity against HDAC4/5/7/9/11, Sirtuin1, and Sirtuin2.

RGFP966 is specific inhibitor of HDAC3, with an IC50 of 0.08 μM and no effective inhibition of any other HDAC at concentrations up to 15 μM.

Remodelin is an inhibitor of acetyl-transferase NAT10.

Remodelin is an inhibitor of acetyl-transferase NAT10.

R306465, also known as JNJ-16241199, is a novel hydroxamate-based histone deacetylase (HDAC) inhibitor with broad-spectrum antitumour activity against solid and haematological malignancies in preclinical models.

Quisinostat (JNJ-26481585) 2HCl is a novel 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.

Pracinostat(SB939) is a potent pan-HDAC inhibitor with IC50 of 40-140 nM with exception for HDAC6; has no activity against the class III isoenzyme SIRT I.

Panobinostat(LBH-589) is a broad-spectrum HDAC inhibitor; low nanomolar concentrations (IC50=5-20 nM) of LBH589 induced cell-cycle arrest, apoptosis, and histone (H3K9 and H4K8) hyperacetylation in MOLT-4 and Reh cell.

Nexturastat A is a potent and selective HDAC6 inhibitor with IC50 of 5 nM, >190-fold selectivity over other HDACs.

MGCD0103 (Mocetinostat) is a potent HDAC inhibitor with IC50 of 0.15, 0.29 and 1.66 μM for HDAC 1, HDAC 2 and HDAC 3, respectively.

MC1568 is a class II (IIa) HDAC inhibitor selective for HDAC4 and HDAC6

LMK-235 is a selective histone deacetylase (HDAC) 4 and HDAC5 inhibitor (IC50 values are 4.22, 11.9, 55.7, 320, 852, 881, and 1278 nM for HDAC 5, 4, 6, 1, 11, 2, and 8, respectively).

HPOB is a novel selective inhibitor of HDAC6 catalytic activity in vivo and in vitro.

GSK3117391 (CHR5154) is a HDAC inhibitor.

Givinostat (ITF2357) is a potent HDAC inhibitor for maize HD2, HD1B and HD1A with IC50 of 10 nM, 7.5 nM and 16 nM. Phase 1/2.

Entinostat (MS-275) strongly inhibits HDAC1 and HDAC3 with IC50 of 0.51 μM and 1.7 μM, compared with HDACs 4, 6, 8, and 10. Phase 1/2.

Droxinostat is a selective HDAC3, HDAC6 and HDAC8 inhibitor.

Dacinostat (NVP-LAQ824, LAQ824) is a highly potent HDAC inhibitor with IC50 of 32 nM.

CUDC-907 (PI3K/HDAC Inhibitor I) is a dual PI3K and HDAC inhibitor for PI3Kɑ, HDAC1, HDAC2, HDAC3 and HDAC10 with IC50 of 19 nM, 1.7 nM, 5 nM, 1.8 nM and 2.8 nM, respectively.

CUDC-101 is a potent multi-targeted inhibitor against HDAC, EGFR and HER2 with IC50 of 4.4 nM, 2.4 nM, and 15.7 nM, and inhibits class I/II HDACs, but not class III, Sir-type HDACs. Phase 1.

CI994 (Tacedinaline) is an anti-cancer drug which inhibits HDAC1 with IC50 of 0.57 μM.

Chidamide is a class I HDAC inhibitor with IC50s of 95/160/67/733 nM for HDAC1/2/3/8; also inhibits HDAC10/11(IC50=78/432 nM); no inhibition on HDAC4/5/7/9/6(IC50>30 uM).

CAY10683 is a potent and selective HDAC inhibitor with IC50 of 119 pM for HDAC2, >3600-fold selectivity over other HDACs.

CAY10603 is a potent and selective inhibitor of HDAC6 with IC50 of 2 pM, as compared with 271, 252, 0.42, 6851, and 90.7 nM for HDAC1, 2, 3, 8, and 10, respectively.

BML-210 is the novel HDAC inhibitor, and its mechanism of action has not been characterized.

Belinostat (PXD101) is a novel pan-HDAC inhibitor with IC50 of 27 nM, with activity demonstrated in cisplatin-resistant tumors.

CRA-026440 hydrochloride is a potent, broad-spectrum HDAC (HDAC) inhibitor. The Ki values against recombinant HDAC isoenzymes HDAC1, HDAC2, HDAC3, HDAC6, HDAC8, and HDAC10 are 4 nM, 14 nM, 11 nM, 15 nM, 7 nM, and 20 nM respectively. CRA-026440 hydrochloride shows antitumor and antiangiogenic activities.

SAHA-OH is a selective HDAC6 inhibitor (IC50=23 nM), shows a 10- to 47-fold selectivity for HDAC6 compared to HDAC 1, 2, 3, and 8. SAHA-OH shows anti-inflammatory activity, and attenuates macrophage apoptosis.

DKFZ-748 is a selective HDAC10 inhibitor (pIC50=7.66), and shows anti-tumor activity.