xanthine

Xanthine ( or ; archaically xanthic acid; systematic name 3,7-dihydropurine-2,6-dione) is a purine base found in most human body tissues and fluids and in other organisms. Several stimulants are derived from xanthine, including caffeine, theophyline, and theobromine.Xanthine is a product on the pathway of purine degradation.

It is created from guanine by guanine deaminase.

It is created from hypoxanthine by xanthine oxidoreductase.

It is also created from xanthosine by purine nucleoside phosphorylase.Xanthine ...