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Credit
Syntheses in the epinephrine series. Pt. II. [The formation and properties of some 2:5- and 2:6-substituted pyrazines and their conversion into amino-ketones and imino-diketones] / by Frank Tutin. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.
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This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.