Z(OMe)-Lys(Z)-Lys(Z)-Leu-Leu-NH2

(S)-4-isobutyl-2-thioxo-thiazolidin-5-one

estrone-3-O-CH2CO-Tyr(2,6-dichlorobenzyl)-Gly-Gly-Phe-Leu-NH2

(3S,6S)-3,6-diisobutylpiperazine-2,5-dione

Leu-Leu-Leu-NH2