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5-Acetyl-4-methyl-1-(β-D-ribofuranosyl) -imidazole-5′-phosphate reacts with diphenylphospho chloridate forming the asymmetrical pyrophosphate ester. This in turn reacts with tri-n-butylammonium phosphate yielding 5-acetyl-4-methyl-imidazole-riboside-5′-diphosphate and with tri-rcbutylammonium pyrophosphate to give the nucleotide triphosphate.
5-Acetyl-4-methyl-imidazole-riboside-5′-pyrophosphate shows in the test with pyruvate kinase a reaction rate three times slower than that of ADP; but the same Km as that of ADP. The ATP analogue is only about 10% as effective as ATP itself in the test with hexokinase, 3-phosphoglycerate kinase and gluconate kinase. Adenylate kinase and NAD+ kinase show no activity when ATP is replaced by the nucleotide-triphosphate-analogue. In presence of ATP the analogue strongly inhibits the reaction of adenylate kinase.