(D-Phe(sup 2)-leu(sup 3)-D-phe(sup 6))-LHRH (D-Phe(sup 2)-leu(sup 3)-D-phe(sup 6))-luteinizing hormone-releasing horomone Luteinizing hormone-releasing hormone, (D-phe(sup 2)-leu(sup 3)-D-phe(sup 6))- OK6622000