| | Substance groups | Derivatives | Isotype | Study phase |
| | Hydroxamates | Trichostatin A (TSA) | I, II | | | Suberoylanilide hydroxamic acid (SAHA, vorinostat) | I, II, IV | III | | LBH589 (panobinostat) | I, II, IV | II | | PCI24781 (CRA-024781) | I, IIb | I | | LAQ824 | I, II | I | | PXD101 (belinostat) | I, II, IV | II | | ITF2357 | I, II | II | | SB939 | Unknown | I | | JNJ-16241199 (R306465) | I | I | | m-carboxycinnamic acid bishydroxamide (CBHA) | | | | Scriptaid | | | | Oxamflatin | | | | Pyroxamide | | | | Cyclic hydroxamic acid containing peptides (CHAPs) | | |
| | Short chain fatty acids | Butyrate | I, IIa | II | | Valproate | I, IIa | II | | AN-9 | | II | | OSU-HDAC42 | | |
| | Benzamides | MS-275 (entinostat) | 1, 2, 3, 9 | II | | MGCD0103 | 1, 2, 3, 11 | II | | Pimelic diphenylamide | 1, 2, 3 | | | M344 | | | | N-acetyldinaline (CI-994) | | II |
| | Cyclic tetrapeptides | Apicidine | I, II | | | Trapoxins | | | | HC-toxin | | | | Chlamydocin | | | | Depsipeptide (FR901228 or FK228) (romidepsin) | 1, 2, 4, 6 | II |
| | Sulfonamide anilides | N-2-aminophenyl-3-[4-(4-methylbenzenesulfonylamino)-phenyl]-2-propenamide | | |
| | Others | Depudecin | | | | NDH-51 | | | | KD5150 | Pan-HDACI | |
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Class I: HDAC 1, 2, 3, 8; class IIa: HDAC 4, 5, 7, 9; class IIb: HDAC 1, 2, 3, 8; class III: HDAC 6, 10; class IV: HDAC 11.
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