A colorless crystalline dicarboxylic acid, C4H6O4, occurring naturally in amber and important in the Krebs cycle. It is also synthesized for use in pharmaceuticals and perfumes.

• 琥珀酸：一种无色的结晶三羧酸，C4H6O4，天然地存在于琥珀中，在克雷布斯循环中很重要。可通过人工合成用于药物和香水中