Inosine -13C10,15N4 is 13 C and 15 N labeled Inosine. Inosine is an endogenous purine nucleoside produced by catabolism of adenosine. Inosine has anti-inflammatory, antinociceptive, immunomodulatory and neuroprotective effects. Inosine is an agonist for adenosine A 1 ( A 1 R ) and A 2A ( A 2A R ) receptors.