Guanine is a purine organic compound, which is a kind of purine. It is composed of carbon and nitrogen atoms, has a characteristic double ring structure, and is connected with cytosine by three hydrogen bonds. It exists in seabird dung in free or bound state. It is one of five different nuclear bases, and exists in deoxyribonucleic acid and ribonucleic acid at the same time
Properties: white flake crystal. Melting point 134 ~ 134.4 ℃, boiling point 294.5 ℃