A yellow carotenoid pigment, C40H56O2, found widely in nature, first isolated in corpus luteum but later discovered in body fats, egg yolk, and green plants;xanthophyll.

• 叶黄素一种黄色的类似胡萝卜素的色素，C40H56O2，大量存在于自然界中，最初从黄体素中分离出来，后在体内脂肪、蛋黄、绿色植物中也发现了它的存在；胡萝卜醇