B-endorphin fragment 1-27;B-ENDORPHIN FRAGMENT 1-27, HUMAN;BETA-ENDORPHIN, FRAGMENT 1-27;fragment1-27;β-endorphin human fragment 1-27;beta-endorphin, human, fragment 1-27;ACETYL, BETA-ENDORPHIN (1-27), HUMAN;ACETYL-TYR-GLY-GLY-PHE-MET-THR-SER-GLU-LYS-SER-GLN-THR-PRO-LEU-VAL-THR-LEU-PHE-LYS-ASN-ALA-ILE-ILE-LYS-ASN-ALA-TYR-OH