A structural isomer of citral that is obtained from the oxidation of nerol and is used to make perfumes and flavorings.

顺丁烯二酸氧化形成的酸（如在脂肪和碳水化合物的新陈代谢中）。

He crushed a hardtack biscuit, then mixed the crumbs with water and a bit of pemmican for flavoring.But each lumpy mouthful stuck in his throat.

他把饼干敲碎，水搅和，然后干肉饼就着吃起来，但食物粗糙，无法下咽。