CXD101 是一种有效的，选择性的，具有口服活性的 I 类 HDAC 抑制剂，对 HDAC1，HDAC2 和 HDAC3 的 IC50 分别为 63 nM，570 nM 和 550 nM。CXD101 对 II 类 HDAC 没有活性，并具有抗肿瘤活性。

Fimepinostat (CUDC-907) 有效抑制 I 型 PI3K 及 I 和 II 型 HDAC 酶，作用于 PI3Kα/PI3Kβ/PI3Kδ 和 HDAC1/HDAC2/HDAC3/HDAC10 ，IC50 分别为 19/54/39 nM 和 1.7/5.0/1.8/2.8 nM。

Tubacin is a selective inhibitor of HDAC6 via inhibition of the second deacetylase domain (DD2).

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.

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.

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.

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.