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Related to pyrimidine bases: Purine nucleotides
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The purine or pyrimidine bases are attached to the backbone through methylene carbonyl linkages.
Although scientists have shown that the purine bases, adenine and guanine, form readily under simulated early Earth conditions, they have also noted that the pyrimidine bases, cytosine and uracil, do not.
The DNA code for the human genome contains some six billion combinations of the four purine or pyrimidine bases (adenine, cytosine, guanine, and thymine) of which half--as of this writing--are considered redundant.
In 1953 Watson and Crick suggested that DNA consisted of two chains of nucleotides arranged as a double helix, with the purine and pyrimidine bases facing each other and the phosphate links on the outside.