A white crystalline amino acid, C9H11NO3, that is derived from the hydrolysis of proteins such as casein and is a precursor of epinephrine, thyroxine, and melanin.

• 酪氨酸一种白色晶体状氨基酸，C9H11NO3，从酪蛋白等蛋白质的水解中产生，是肾上腺素、甲状腺素、黑色素的母体