Global Histone Deacetylase Inhibitors Market By Type (Hydroxamic Acids , Cyclic Tetrapeptides , Benzamides , Electrophilic Ketones , and Aliphatic Acid), By Application (Psychiatry and Neurology , Cancer Treatment , and HIV), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029