Gamma-Mangostin is a novel competitive 5-hydroxytryptamine 2A (5-HT2A) receptors antagonist, purified from the fruit hull of the medicinal plant Garcinia mangostana. Gamma-Mangostin is a inhibitor of Transthyretin (TTR) fibrillization, it binds to the thyroxine (T4)-binding sites and stabilized the TTR tetramer^[2]. Gamma-Mangostin inhibits [3^H] spiperone binding to cultured rat aortic myocytes (IC₅₀=3.5 nM) and reduces The perfusion pressure response of rat coronary artery to 5-HT2A (IC₅₀=0.32 µM) ^[1]. IC50 & Target: 5-hydroxytryptamine 2A (5-HT2A) receptors^[1]