The title compound was prepared by a three-stage enzymatic procedure c
onsisting of (i) RNA hydrolysis to a mixture of ribonucleosides using
intact mycelium of Spicaria violacea, (ii) transribosylation of exogen
ous adenine employing whole cells of Escherichia coli as a biocatalyst
, and (iii) conversion of formed adenosine into ATP by the enzymes of
alcohol fermentation and the kinases extracted from baker's yeast.