A potent inhibitor of histone deacetylases (HDACs) of class I and II with anti-tumoral activity. The compound blocks HDAC catalytic activity by chelating zinc ion in the enzyme’s active site. Extensively used in research as epigenetic modifier able to block cell growth and downregulate proliferation-associated factors. It has also been reported that trichostatin A induces apoptosis via a histone-modification independent mechanism in oral squamous cell carcinoma cell lines. Initially discovered as anti-fungal compound from Streptomyces hygroscopicus for the control of fungal infections caused by the genus Trichophyton.