128531-63-5 7-Pro-9-acetyl-lys-beta-endorphin (6-17) L-Leucine, N-(N-(N-(N-(1-(N-(N2-(N-(N6-acetyl-N2-(N-(1-L-threonyl-L-prolyl)-L-alpha-glutamyl)-L-lysyl)-L-seryl)-L-glutaminyl)-L-threonyl)-L-prolyl)-L-leucyl)-L-valyl)-L-threonyl)- Org 31258 Org-31258 beta-Endorphin (6-17), pro(7)-acetyl-lys(9)- beta-Endorphin (6-17), pro(7)-lys(Ac)(9)-