草酰乙酸 (Oxaloacetic acid) is a four-carbon dicarboxylic acid that plays a crucial role in the metabolic pathways of living organisms. It is an intermediate in the Krebs cycle, which is essential for energy production in cells. This compound helps in the conversion of carbohydrates, fats, and proteins into energy. In addition to its role in metabolism, 草酰乙酸 is involved in the synthesis of various amino acids, such as aspartate and glutamate. It can also be used in the production of certain pharmaceuticals and is studied for its potential applications in biochemistry and nutrition.