coumarin, an extract from tonka beans, may be used in making the extract.
coumarin, a white crystalline product found in Tonka beans, and prepared synthetically from salicylic acid.
If coumarin is present, a brown, precipitate will form, and if stirred with a rod it will collect in dark green flecks.
These researches incidentally solved the constitution of coumarin, the odoriferous principle of woodruff.
Good hay should come out green and with the odour of coumarin—to which is due the scent of new-mown hay.