Attribution 4.0 International (CC BY 4.0)
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Credit
The absorption spectra of some substituted pyrazines and their salts / by Frank Tutin and Frederic W. Caton. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.
Provider
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.