give one method of synthesis of xanthene and caffeine.
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It is also obtained as a byproduct in the manufacture of caffeine-free caffeine. ... Some of the early methods (Fischer and Traube's) [2,3] were not aimed directly at the synthesis of caffeine, rather they were based on purine and related derivatives starting from urea or uric acid in several steps.
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Xanthine is a product on the pathway of purine degradation. It is created from guanine by guanine deaminase. ... It is also created from xanthosine by purine nucleoside phosphorylase (PNP).
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