Histone deacetylase 6 (HDAC6) is a protein known to be involved in a wide array of cancers. Although there are currently 4 approved HDAC inhibitors to date, these drugs lack the selectivity to only target HDAC6, given its high structural similarities with 10 other HDAC proteins, resulting in severe side-effects in patients such as nausea, diarrhea, and cardiac toxicities. Moreover, these approved drugs are also easily eliminated by the body, requiring the patients to take high doses frequently, further worsening the toxicity profile.