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German chemist Oswald Schmiedeberg (1838-1921)

Oswald Schmiedeberg and Richard Koppe, working at the University of Dorpat, discovered muscarine as a component of the Amanita muscaria mushroom

Schmiedeberg O, Koppe R. Das Muscarin. Das giftige Alkaloid des Fliegenpilzes (Agaricus muscarius L) seine Darstellung, chemischen Eigenschaften, physiologischen Wirkungen, toxicologische Bedeutung und sein Verhältniss zur Pilzvergiftung im allgemeine. Leipzig: F C W Vogel, 1869

(Photograph by unknown photographer around 1900. Courtesy of the U.S. National Library of Medicine. Edited by Dr Douglas J Lanska to correct dust and damage to the image.)