Endogenous peptide fragment that is a potent agonist for MRGPRX1 (EC50 values are 8 - 150 nM); first isolated from bovine adrenal medulla. Unlike BAM 22P , does not contain the met-enkephalin motif therefore displays no affinity for opioid receptors.

Periplocoside M (compound 8) is a natural product isolated from the root bark of Periploca sepium. Periplocoside M shows antitumor activity against human A-549 and HepG2 cell lines, with the IC50 of 4.84 and 7.06 μM.

PROTAC PD-1/PD-L1 degrader-1, a Cereblon E3 ligand-based compound, is a PD-1/PD-L1 PROTAC that effectively inhibits the PD-1/PD-L1 interaction with an IC50 of 39.2 nM.