Tags: Chemical Compound, Chemical Substance.
Xanthosine is a nucleoside derived from xanthine and ribose. It is the biosynthetic precursor to 7-methylxanthosine by the action of 7-methylxanthosine synthase. 7-Methylxanthosine in turn in the precursor to theobromine (active alkaloid in chocolate) which in turn is the precursor to caffeine the alkaloid in coffee and tea.
