Boc-D-Phe-Gln-Trp-Ala-Val-Gly-His-LeuΨ(CH2CH2)D-LeuNH2

Boc-D-Phe-Gln-Trp-Ala-Val-Gly-His-β-homo-Leu-D-Nle-NH2

Boc-D-Phe-Gln-Trp-Ala-Val-Gly-His-LeuΨ(CH2NH)Leu-NH2

((S)-2-{(S)-2-[(S)-2-[(S)-2-((R)-2-tert-Butoxycarbonylamino-3-phenyl-propionylamino)-4-carbamoyl-butyrylamino]-3-(1H-indol-3-yl)-propionylamino]-propionylamino}-3-methyl-butyrylamino)-acetic acid benzyl ester

((S)-2-{(S)-2-[(S)-2-((S)-2-Amino-4-carbamoyl-butyrylamino)-3-(1H-indol-3-yl)-propionylamino]-propionylamino}-3-methyl-butyrylamino)-acetic acid benzyl ester