Lohrmann R, Orgel L E
J Mol Evol. 1978 May 12;11(1):17-23. doi: 10.1007/BF01768021.
Organic pyrophosphates such as UppA and NAD are formed when a solution containing a nucleotide, a nucleoside 5'-polyphosphate, Mg2+ and imidazole are allowed to dry out. We suggest that this synthesis may have occured concurrently with oligonucleotide formation.