A dicarboxylic organic acid produced commercially by chemical synthesis and fermentation; the trans isomer of maleic acid; colorless crystals, melting point 87°C (191 °F); used to make resins, paints, varnishes and inks, in food, as a mordant (dye fixer/stabilizer), and as a chemical intermediate. Also known as boletic acid.
One of the organic acids in the citric acid cycle. It is used as a substitute for tartaric acid in beverages and baking powders.