ACY-957 (HDAC Inhibitor C001) is an orally active and selective inhibitor of HDAC1 and HDAC2 (IC50s: 7 nM, 18 nM, and 1300 nM against HDAC1/2/3) and shows no inhibition on HDAC4/5/6/7/8/9.

Fimepinostat (CUDC 907) is an orally bioavailable inhibitor of both phosphoinositide 3-kinase (PI3K) class I and pan-histone deacetylase (HDAC) enzymes, with potential antineoplastic activity. Upon oral administration, CUDC-907 inhibits the activity of both PI3K class I isoforms and HDAC, thereby preventing the activation of the PI3K-AKT-mTOR signal transduction pathway that is often overactivated in many cancer cell types.

HDAC-IN-20 is used as an HDAC inhibitor that acts by preventing HDAC-mediated diseases.

HDAC3 inhibitor is an allosteric inhibitor of histone deacetylase 3 (HDAC3; Ki = 0.16 nM). It is selective for HDAC3 over HDAC1 and HDAC2 (IC50s = 0.95, 11.81, and 95.45 nM, respectively, using recombinant HDACs). In addition, it is selective for acute myeloid, monocytic, and lymphoblastic leukemia cell lines (EC50s = 36.37, 76.64, and 151.7 nM, respectively) over chronic myeloid, acute promyelocytic, and acute lymphoblastic cells (EC50s = 2,160, >10,000, and >10,000 nM, respectively).

Tasquinimod (ABR-215050) is a quinoline-3-carboxamide linomide analog with antiangiogenic and potential antineoplastic activities. Tasquinimod has been shown to decrease blood vessel density but the exact mechanism of action is not known. This agent has also been shown to augment the antineoplastic effects of docetaxel and androgen ablation in a murine model of prostate cancer involving human prostate cancer xenografts.

Romidepsin (FR 901228) is an HDAC inhibitor that inhibits HDAC1/2/4/6 (IC50=36/47/510/1400 nM). Romidepsin has antitumor activity and can be used for the treatment of peripheral T-cell lymphoma and cutaneous T-cell lymphoma.

Trichostatin A (TSA) is a natural derivative of diene isohydroxamic acids. Trichostatin A is a histone deacetylase inhibitor (IC50=1.8 nM) that is reversible and specific. Trichostatin A leads to the hyperacetylation of core histones, which regulates chromatin structure.

Tucidinostat (Chidamide) is an effective and orally bioavailable HDAC enzymes class I (HDAC1/2/3) and class IIb (HDAC10) inhibitor, with IC50s of 95, 160, 67 and 78 nM, less active on HDAC8/11 (IC50: 733/432 nM), and shows no effect on HDAC4/5/6/7/9.

Valproic acid sodium salt (Sodium Valproate) is the sodium salt form of valproic acid with anti-epileptic activity. Valproic acid sodium salt is converted into its active form, valproate ion, in blood. Although the mechanism of action remains to be elucidated, Valproic acid sodium salt increases concentrations of gamma-aminobutyric acid (GABA) in the brain, probably due to inhibition of the enzymes responsible for the catabolism of GABA. This potentiates the synaptic actions of GABA. Valproic acid sodium salt may also affect potassium channels, thereby creating a direct membrane-stabilizing effect.

Theophylline monohydrate (Quibron) appears to inhibit phosphodiesterase and prostaglandin production, regulate calcium flux and intracellular calcium distribution, and antagonize adenosine. Theophylline monohydrate is a natural alkaloid derivative of xanthine isolated from the plants Camellia sinensis and Coffea arabica. Physiologically, this agent relaxes the bronchial smooth muscle, produces vasodilation (except in cerebral vessels), stimulates the CNS, stimulates the cardiac muscle, induces diuresis, and increases gastric acid secretion; it may also suppress inflammation and improve contractility of the diaphragm.

Panobinostat (NVP-LBH589) is a broad-spectrum HDAC inhibitor (IC50=5 nM) with oral activity and non-selectivity. Panobinostat has antitumor activity and induces apoptosis and autophagy.

Sodium 4-phenylbutyrate (TriButyrate), a transcriptional regulator, reversibly inhibits class I and II histone deacetylases (HDACs )resulting in a global increase in gene expression, decreased cellular proliferation, increased cell differentiation, and the induction of apoptosis in susceptible tumor cell populations.

mTOR/HDAC-IN-1 HCl is a potent dual inhibitor of mTOR and HDAC with potential anti-inflammatory, anti-proliferative, autophagy and apoptosis-inducing effects for cancer research.

4-Phenylbutyric acid (Benzenebutyric acid) is an inhibitor of HDAC,and is an antineoplastic agent.

HDAC-IN-52 is a pyridine-containing HDAC inhibitor that inhibits HDAC1, HDAC2, HDAC3 and HDAC10 with IC50s of 0.189, 0.227, 0.440 and 0.446 μM, respectively. HDAC-IN-52 can be used in cancer research.

HDAC8-IN-20a (HDAC8 inhibitor-20a) is a potent and selective HDAC8 inhibitor with an IC50 of 27 nM. HDAC8-IN-20a blocks activation of growth receptor survival signals.

HDAC-IN-7 (HBI-8000) (Chidamide impurity) is an impurity of Chidamide. Chidamide is a potent and orally bioavailable inhibitor of HDAC enzymes class I (HDAC1/2/3) and class IIb (HDAC10).

Homobutein (3-O-Methylbutein) is a dual inhibitor of HDACs and NF-κB with IC50s of 190 and 38 μM. Homobutein is an iron chelator with anticancer, anti-inflammatory, antiparasite, and antioxidation activities.

HDAC-IN-57 is an orally active pan-inhibitor of histone deacetylase (HDAC), inhibiting HDAC1, HDAC2, HDAC6, and HDAC8 with IC50 values of 2.07 nM, 4.71 nM, 2.4 nM, and 107 nM, respectively. HDAC-IN-57 inhibits LSD1 with an IC50 value of 1.34 μΜ. HDAC-IN-57 has anti-tumor activity and can induce apoptosis.

HDAC-IN-51 is an HDAC inhibitor.

ST7612AA1 is a novel potent and oral HDCA inhibitor that acts as an HIV-1 latency reactivator. ST7612AA1 showed significant antitumor activity at low concentrations in vitro and in vivo. ST7612AA1 has potential anticancer activity and can be used to study malaria.

Givinostat hydrochloride (ITF2357 hydrochloride) is an inhibitor of HDAC with IC50 of 198 and 157 nM for HDAC1 and HDAC3, respectively. Givinostat hydrochloride exhibits anti-inflammatory, anti-angiogenic, and antineoplastic activities.

MC2590 is a potent and selective histone deacetylase (HDAC) inhibitor that inhibits HDAC1-3, -6, -8, and -10 activities, induces cell cycle arrest, and promotes apoptosis.

CRA-026440 hydrochloride is a potent and broad-spectrum HDAC inhibitor. CRA-026440 hydrochloride exhibits 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 exhibits antitumor and antiangiogenic activities.

mTOR/HDAC-IN-1 (Compound 50) is a dual inhibitor targeting both mTOR and HDAC with respective IC50 values of 0.49 nM and 0.91 nM. It holds potential as an anti-cancer agent [1].This compound is unstable in powder form and other related salt forms are recommended.

Crebinostat is a potent histone deacetylase (HDAC) inhibitor, inhibiting HDAC1, HDAC2, HDAC3, and HDAC6 with IC50s of 0.7 nM, 1.0 nM, 2.0 nM, and 9.3 nM, respectively.Crebinostat increases the density of synapsin-1 punctae along dendrites in neurons in vitro. Crebinostat increased the density of synapsin-1 punctae along dendrites in neurons in vitro. crebinostat modulated chromatin-mediated neuroplasticity and enhanced memory in mice. crebinostat induced histone H3 and histone H4 acetylation and enhanced the expression of the cAMP-responsive element binding protein (CREB) target gene, Egr1. Crebinostat induces histone H3 and histone H4 acetylation and enhances the expression of Egr1, a cAMP response element binding protein (CREB) target.

SS-208 is a selective inhibitor of HDAC6 (IC50 = 12 nM) with anti-tumor activity. SS-208 shows selectivity over other HDAC subtypes.

MPT0G211 is a highly selective and orally active HDAC6 inhibitor (IC50=0.291 nM) that has neuroprotective effects and has shown anti-metastatic activity in human breast cancer cells. MPT0G211 has 1,000 times more affinity for HDAC6 than other HDAC subtypes. MPT0G211 can cross the blood-brain barrier and could be used to improve tau phosphorylation and cognitive deficits in Alzheimer's disease models.

MI-192 is a selective HDAC2 and HDAC3 inhibitor with IC 50 s of 30 nM and 16 nM, respectively. MI-192 is more selective for HDAC2/3 than other HDAC isomers.MI-192 induces myeloid leukaemic cells apoptosis. MI-192 has potential use in leukaemia and anti-stroke [1] [2].

HDAC-IN-4 is a selective HDAC6 and HDAC10 inhibitor (pIC50s: 7.2 and 6.8 in BRET assay) with antitumoral activity.

Vorinostat (SAHA) is a pan-histone deacetylase (HDAC) inhibitor (IC50=10 nM) with inhibitory activity against HDAC1/2/3/6/7/11. Vorinostat has antitumor activity, induces cell differentiation, blocks the cell cycle and induces apoptosis.

Scriptaid (GCK1026) is an inhibitor of HDAC, and has a greater effect on acetylated H4 than H3.

AR42 (OSU-HDAC42) is an HDAC inhibitor (IC50: 30 nM).

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

Valproic Acid (2-Propylpentanoic Acid) is an HDAC inhibitor that inhibits HDAC1 activity, induces HDAC2 degradation, and is orally active. Valproic Acid can be used in epilepsy and bipolar disorder research.

GSK4112 (SR6452) is a Rev-erbα agonist with EC50 of 0.4 μM, also is a small molecule chemical probe for the cell biology of the nuclear heme receptor Rev-erbα.

Entinostat (MS-275) (MS-275) is an inhibitor of HDACs that inhibits HDAC1 and HDAC3 (IC50s: 0.18/0.74 μM).

ST8155AA1, a component of antibody-drug conjugates (ADCs), is tethered to an HDAC inhibitor via a linker and exhibits antitumor activity [1].

YPX-C-05 is an isohydroxamic acid derivative and HDAC inhibitor with vasodilatory and antihypertensive activity.YPX-C-05 is used in the study of hypertension and vascular related disorders.

1-Alaninechalmydocin is a fungal metabolite originally isolated from a Great Lakes-derived Tolypocladium sp. and an inhibitor of histone deacetylases (HDACs). It reduces total HDAC activity in HeLa cell lysates in a concentration-dependent manner. 1-Alaninechlamydocin reduces proliferation of MIA PaCa-2, PANC-1, and hTERT-HPNE cells (GI50s = 5.3, 14, and 2.0 nM, respectively).

Suberoylanilide hydroxamic acid (SAHA) is a class I and class II histone deacetylase (HDAC) inhibitor that binds directly to the catalytic site of the enzyme thereby blocking substrate access. [1] coumarin-Suberoylanilide hydroxamic acid (c-SAHA) is a SAHA derivative where the anilino cap group is replaced by 7-amino-4-methylcoumarin to produce a fluorescent probe that competitively binds HDAC. [2] The fluorescence excitation and emission maxima of free c-SAHA is 325 and 400 nm

PH14, a dual PI3K/HDAC inhibitor, demonstrates potent inhibition with IC50 values of 20.3 nM for PI3Kα and 24.5 nM for HDAC3. It exhibits antiproliferative effects and induces apoptosis in Jeko-1 cells, making it a valuable tool in cancer research, including lymphoma studies [1].

Mz325 serves as a dual inhibitor of both HDAC and Sirt2, exhibiting an IC50 of 9.7 µM against Sirt2, which are implicated in the pathogenesis of cancer and neurodegenerative diseases [1].

KPZ560, a potent HDAC 1 and HDAC 2 inhibitor, exhibits IC50 values of 12 nM and 68 nM, respectively. This compound enhances spine density in mouse granule neuron dendrites and inhibits growth in the MCF-7 breast cancer cell line [1].

CG347B is a selective inhibitor of HDAC6.

KH16 is a potent HDAC inhibitor that specifically targets class I HDACs (HDAC1, HDAC2 and HDAC3) with IC50 values between 6 and 34 nM. KH16 is able to stimulate apoptosis and can inhibit gene expression patterns in a wide range of tumor cells.

2-hexyl-4-Pentynoic Acid, a valproic acid (VPA) derivatives, is a potent and robust HDACs inhibitor with IC50 value of 13 μM.

ST8154AA1, an antibody-drug conjugate (ADC) component coupled with an HDAC inhibitor via a linker, exhibits antitumor activity [1].

SR-4370 is an HDAC inhibitor. SR- 4370 exhibited IC50 values of 0.5 μM, 0.1 μM and 0.06 μM towards HDAC1, HDAC2 and HDAC3, resp.

VEGFR2/HDAC1-IN-1 (compound 13) is a potent dual inhibitor of VEGFR-2 and HDAC, with IC50 values of 57.83 nM for VEGFR-2 and 9.82 nM for HDAC. It arrests the cell cycle at the S and G2 phases and induces apoptosis in HeLa cells, demonstrating an anti-angiogenic effect [1].