Ebselen or 2-phenyl-1, 2-benzisoselenazol-3(2H)-one (also called PZ 51 or DR3305), is a mimic of glutathione peroxidase and can also react with peroxynitrite. It is being investigated as a possible treatment for reperfusion injury and stroke, hearing loss and tinnitus, and bipolar disorder. Ebselen is a potent scavenger of hydrogen peroxide as wel...