Which one of the following is correct structure for cytosine?

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Canvas Classes · Accepted Answer

Cytosine is natively derived from a six-membered pyrimidine base ring. Its IUPAC systematic name precisely identifies it broadly as 4-amino-3H-pyrimidin-2-one (often safely referred functionally as 2-oxy-4-aminopyrimidine). Consequently, its characteristic structure fundamentally encompasses exactly one specific prominent exocyclic amino group explicitly located at position 4 and a cleanly corresponding carbonyl oxygen specifically anchored strictly at position 2.

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