A bitter glucoside compound extracted from horse chestnut bark and seeds, used in medicine and as a fluorescent marker in scientific research.
From Latin Aesculus (horse chestnut tree) + -in (chemical suffix). The name directly references the tree species from which it's derived.
Aesculin glows brilliantly under ultraviolet light, making it incredibly useful in laboratories for tracking molecules and studying how diseases spread through tissues—scientists literally use it to make the invisible visible.
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