A natural amine, C5H15NO2, often classed in the vitamin B complex and a constituent of many other biologically important molecules, such as acetylcholine and lecithin.

• 胆碱一种天然的碳氢基氨，C5H15NO2，经常归类为维生素B复合体并且是许多其他生物重要分子的组成部分，如乙醯胆素和卵磷脂