Present-day genetic material, DNA and RNA, consists of five major nucleic acid bases (A, G, T, C, and U) and the sugar-phosphate backbone. In addition to the question of their from prebiotic matter, there are more subtle issues, including, in the case of purines, the site of attachment of ribose/deoxyribose at N9 versus N3. The reaction of adenine with protected sugar halides gives a mixture containing more or less equal amounts of N9 and N3 derivatives.
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Bhat et al. (1996) studied this question.
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