A coumarin derivative used in pharmaceutical manufacture (it is said to have venotonic, capillary-strengthening, and antiphlogistic activity). In diagnostic microbiology it is a component of bile esculin agar: Group D streptococci hydrolyse esculin to esculetin and dextrose and the esculetin can be detected by the formation of a blackish-brown coloured complex when it reacts with ferric citrate. Extracted from the bark of flowering ash Fraxinus ornus or the leaves and bark of the horsechestnut tree Aesculus hippocastanum.
http://www.chem-online.org/plant-extract/esculin.htm Additional information from chem-online.org.
Subjects: Medicine and Health.