Purine: Purine is a heterocyclic nitrogenous molecule consisting of a pyrimidine ring fused to an imidazole ring. It is the most widespread nitrogenous heterocycle in nature. Among the nine possible tautomers of the purine nucleus, the CH forms (C2H, C4H, C5H, C6H and C8H), as well as the N1H and N3H forms can be neglected because very unlikely (break in aromaticity), only the N7H and especially N9H (99%) exist in neutral solution3. The bare purine nucleus does not exist in nature....
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