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A [[Precursor (chemistry)|precursor]] to aspirin found in the bark of the [[willow tree]] (genus ''Salix'') has been used for its health effects for at least 2,400 years.<ref name=Jon2015>{{cite book |vauthors = Jones A |title=Chemistry: An Introduction for Medical and Health Sciences|date=2015|publisher=John Wiley & Sons|isbn=978-0-470-09290-3|pages=5–6|url=https://books.google.com/books?id=ubE0ILq_aDQC&pg=PA6}}</ref><ref>{{cite book |vauthors = Ravina E |title=The Evolution of Drug Discovery: From Traditional Medicines to Modern Drugs |date=2011 |publisher=John Wiley & Sons |isbn=978-3-527-32669-3 |page=24 |url=https://books.google.com/books?id=iDNy0XxGqT8C&pg=PA24}}</ref> In 1853, chemist [[Charles Frédéric Gerhardt]] treated the medicine [[sodium salicylate]] with [[acetyl chloride]] to produce acetylsalicylic acid for the first time.<ref name="Jeffreys2008">{{cite book |url=https://books.google.com/books?id=a9gkBwAAQBAJ |title=Aspirin the remarkable story of a wonder drug. |vauthors=Jeffreys D |date=2008 |publisher=Bloomsbury Publishing USA |isbn=978-1-59691-816-0 |archive-url=https://web.archive.org/web/20170908213430/https://books.google.com/books?id=a9gkBwAAQBAJ |archive-date=8 September 2017 |url-status=}}{{rp|46–48}}</ref> Over the next 50 years, other chemists, mostly of the German company [[Bayer]], established the chemical structure and devised more efficient production methods.<ref name=Jeffreys2008/>{{rp|69–75}}
Aspirin is available [[Over-the-counter drug|without medical prescription]] as a proprietary or [[generic medication]]<ref name=AHFS/> in most jurisdictions. It is one of the most widely used medications globally, with an estimated {{convert|40000|tonne}} (50 to 120 billion [[Tablet (pharmacy)|pills]])
==Brand vs. generic name==
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