Ustilagic acid
Ustilagic acid is an organic compound with the formula C36H64O18. The acid is a cellobiose lipid produced by the corn smut fungus Ustilago maydis under conditions of nitrogen starvation. The acid was discovered in 1950 and was proved to be an amphipathic glycolipid with surface active properties. The name comes from Latin ustus which means burnt and refers to the scorched appearance of the smut fungi.