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

(3R,6R)-3,6-Diisobutyl-piperidin-2-one

(S)-tert-butyl 2-isobutyl-4-oxo-6-propyl-3,4-dihydropyridine-1(2H)-carboxylate

(2R,6R)-2-isobutyl-6-propyl-piperidine

4-[(S)-2-Benzyloxycarbonylamino-2-((1R,4R)-4-carbamoyl-1-isobutyl-6-methyl-heptylcarbamoyl)-ethyl]-imidazole-1-carboxylic acid benzyl ester