Yellow pigment C₁₇H₂₂N₄O₆, a component of the vitamin B complex, found esp. in whey, eggs, and green leaves.

核黄素(复合维他命 B 的构成要素，多存在于乳浆、蛋类和绿叶中)。化学式为 C₁₇H₂₂N₄O₆。