ATP Disodium salt is a P2 purinoceptor agonist.

5-Methoxy-DL-tryptophan is a molecule produced by endothelial cells to modulate inflammatory responses and protect against systemic inflammation.

Potent agonist of the nociceptin (ORL1) receptor, demonstrated both in vitro and in vivo. Selective, competitive antagonism at the nociceptin receptor has also been reported (pA2 = 7.02 and 6.75 in the guinea pig ileum and mouse vas deferens respectively).