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Chapter 28: Nucleosides, Nucleotides and Nucleic Acids
Ch 28 contents
Pyrimidines and Purines
Pyrimidine

Purine
Uracil (U)
Thymine (T)
Cytosine (C)



Adenine (A)
Guanine (G)
aromatic resonance character for cytosine
Study Tip:
pyrimidine sounds most like pyridine, the structure it resembles most closely... just an extra N.
and 
pyrimidine         pyridine

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organic chemistry © Dr. Ian Hunt, Department of Chemistry University of Calgary