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From the following article:
Synthesis of activated pyrimidine ribonucleotides in prebiotically plausible conditions
Matthew W. Powner, Béatrice Gerland & John D. Sutherland
Nature 459, 239-242(14 May 2009)
doi:10.1038/nature08013
Figure 1
Pyrimidine ribonucleotide assembly options.
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Figure 2
Development of the synthesis of 2-amino-oxazole 11.
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Figure 3
Pentose amino-oxazoline stability, and assembly chemistry.
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Figure 4
Formation and phosphorylation of the arabinose anhydronucleoside 13.
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Figure 5
Photochemistry of 
-ribocytidine-2',3'-cyclic phosphate 1.
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