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.
Good hay should come out green and with the odour of coumarin—to which is due the scent of new-mown hay.
These researches incidentally solved the constitution of coumarin, the odoriferous principle of woodruff.