Description: Peptide to Endomorphin-1 Form: Lyophilized powder CAS Number : 189388-22-5Molecular Formula : C34H38N6O5Molecular Weight : 610.72Purity : > 95%Chemical Structure : H-Tyr-Pro-Trp-Phe-NH2Application : Endomorphin-1 (YPWF-amide) is the most potent and selective endogenous agonist for the mu-opiate receptor so far described (Ki = 360 pM; 4'000- and 15'000-fold preference over the delta and kappa receptors). It may be a natural ligand for this receptor.Storage/Stability : Shipped at 4°C. Store at -20°C for one year.