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6-Methylpurine-β-D-riboside (β-D-MPR; 6-methylpurine riboside), an antibiotic isolated from culture broths of the basidiomycetes fungi Collybia dryophilia and Collybia maculata, has antifungal, antiviral and antitumor activity. β-D-MPR is an excellent substrate of mammalian adenosine deaminase (ADA), and its mechanism of activation in tumor cells presumably relates to its interaction with this enzyme [1].

[1] Sufrin, J . "Improved Synthesis of β-D-6-Methylpurine Riboside and Antitumor Effects of the β-D- and α-D-Anomers." Molecules 10(2005).