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derivatives of purine are called adenine (a) and guanine (g). the other three bases—thymine (t), cytosine (c), and uracil(u)—are derivatives of pyrimidine. purines, from which adenine is derived, are found in plants and animals. foods high in purines include organs such as liver, brains, and kidneys, and fish
such as anchovies, herring, and mackerel. structure the structure of adenine is critical, in that having only two sites for hydrogen bonding, it binds only to thymine (and uracil in rna), while cytosine, which has three sites for hydrogen bonding, binds only to guanine. these four "code letters" allow...
https://www.newworldencyclopedia.org/entry/Adenine