Cercosporamide, an usnic amide, was originally identified in Cercosporidium henningsii as a host-selective phytotoxin and broad-spectrum antifungal agent and is a potent inhibitor of MAP-kinase interacting kinase-2 (Mnk2; IC50 = 11 nM), JAK3 (IC50 = 31), and Mnk1 (IC50 = 116 nM).