chelerythrin

from The Century Dictionary.

• noun An alkaloid (C₁₉H₁₇NO₄) found in the plants Chelidonium majus, Glaucium luteum, and Sanguinaria Canadensis, and thought to be identical with sanguinarin.
• noun An alkaloid, C₂₁H₁₇NO₄, found in the plants Chelidonium majus. Stylophorum diphyllum, Sanguinaria Canadensis, Macleaya cordata, Glaucium Glaucium, and other plants of the poppy family (Papaveraceæ): colorless in the free state, but forming lemon-yellow salts on the addition of acids. It is not identical with sanguinarin, as was once supposed.