1-5-Adrenorphin (human) 58569-55-4 Adrenorphin (human), 6-de-L-arginine-7-de-L-arginine-8-de-L-valinamide- CCRIS 4225 EINECS 261-335-8 ENKEPHALIN, METHIONINE Lupex MET-enkephalin Methionine enkephalin N-(N-(N-(N-L-Tyrosylglycyl)glycyl)-L-phenylalanyl)-L-methionine NSC 374896 Opioid growth factor Porcine beta-endorphin 1-5 Tyr-Gly-Gly-Phe-Met-OH