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.是什么意思_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.在线翻译_英语_读音_用法_例句