Polarised light micrograph of crystals of Aspirin (acetylsalicylic acid), a common pain reliever. Magnifciation (at 35mm size).

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Photo credit: © SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: analgesic, aspirin, biochemical, biochemistry, chemical, chemistry, compound, compounds, crystal, crystals, drug, pain, pharmaceutical, pharmaceutics, reliever