77761-27-4 beta-Endorphin (6-31) beta-Endorphin, 1-de-L-tyrosine-2-deglycine-3-deglycine-4-de-L-phenylalanine-5-de-L-methionine-27-L-tyrosine-31-L-glutamic acid-, (R-(E))- beta-Endorphin-(6-31)