What is "aesculin"

Esculin \Es*cu"lin\, n. [See Esculic.] (Chem.) A glucoside obtained from the [AE]sculus hippocastanum, or horse-chestnut, and characterized by its fine blue fluorescent solutions. [Written also [ae]sculin.]

n. (alternative form of esculin English)

Aesculin, also rendered Æsculin or Esculin, is a coumarin glucoside that naturally occurs in the horse chestnut ( Aesculus hippocastanum), California Buckeye ( Aesculus californica), Prickly Box ( Bursaria spinosa) and in daphnin (the dark green resin of Daphne mezereum). It is also found in dandelion coffee.