New, Non-Addictive Pain Killer with Fewer Side Effects

>an adenosine A1 receptor agonist elicits analgesia without cardiorespiratory depression”

benzyloxy-cyclopentyladenosine (BnOCPA)

>is an A1R selective agonist discovered to be a "potent and powerful analgesic,

  but does not cause sedation, bradycardia, hypotension or respiratory depression"

https://en.m.wikipedia.org/wiki/Adenosine_A1_receptor

Selective activation of Gαob by an adenosine A1 receptor agonist elicits analgesia without cardiorespiratory depression

https://www.nature.com/articles/s41467-022-31652-2