Ring-expanded (ldauo;fat") nucleosides (RENs) described in this review are analogues of purine nucleosides containing a 5:7-fused imidazodiazepine or imidazotriazepine ring system. They are both of natural and synthetic origin, and are of chemical, biochemical, biophysical, as well as medicinal interest. The important natural RENs include coformycin… (More)
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