27-L-Tyrosine-31-L-tyrosine-beta-Endorphin (sheep) 31-Tyrosyl-beta-endorphin 82284-46-6 Tyr(31)-beta-endorphin Tyrosine-31beta-endorphin beta-Endorphin (sheep), 27-L-tyrosine-31-L-tyrosine- beta-Endorphin, tyr(31)