For context, tonka is valued for its coumarin content and coumarin is maligned for its association with the active ingredient in rat poison and some medications

For context, tonka is valued for its coumarin content and coumarin is maligned for its association with the active ingredient in rat poison and some medications, but is a different molecule. Coumarin is found chiefly in perfumes (functional and fine fragrance) and smells sweet and grassy. In this application, it is sold all over the world, including the US. As a flavor in food, it is banned in the US.