A fragrant crystalline compound, C9H6O2, extracted from several plants, such as tonka beans and sweet clover, or produced synthetically and widely used in perfumes.

• 香豆素，氧杂萘邻铜一种碎片状晶体化合物，C9H6O2，从几种植物中提取，如零陵香豆和草木樨植物，或有机合成且广泛用于香水业