Figure 1.

Main identified products of uridine phosphorylation reactions, where M = quartz sand, Mg²⁺ and urea and structure 1 shows uridine, structure 2 shows 5′-UMP, and structure 3 shows 2′,3′-cUMP. The reaction also afforded the formation of other phosphorylated products such as a dimer molecule U-P-U and 2′-UMP or 3′-UMP.