Xanthinine
(n.)
A complex nitrogenous substance related to urea and uric acid, produced as a white powder; -- so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
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XANTHININE
XANTININA [COMPLESSA SOSTANZA NITROGENA COLLEGATA ALL'UREA E ALL'ACIDO URICO]