What are the positions of ' N ' atoms present in pyrimidine ring of nucleic acids?

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Pyrimidine is a six-membered heterocyclic aromatic ring found in nucleic acids (cytosine, thymine, and uracil).

According to the IUPAC numbering system for pyrimidines, the numbering starts at one of the nitrogen atoms and proceeds in the direction that gives the second nitrogen atom the lowest possible number.

Therefore, the nitrogen atoms in the pyrimidine ring are located at positions 1 and 3.

Answer: 1 and 3

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