11-[(S)-2-((S)-1,2-Bis-hexadecylcarbamoyl-ethylcarbamoyl)-1-tert-butoxycarbonyl-ethylcarbamoyl]-undecanoic acid tert-butyl ester

(S)-2-Amino-N-((S)-1,2-bis-hexadecylcarbamoyl-ethyl)-succinamic acid tert-butyl ester

(S)-N-((S)-1,2-Bis-hexadecylcarbamoyl-ethyl)-2-(3-tert-butoxycarbonyl-propionylamino)-succinamic acid tert-butyl ester

5-[(S)-2-((S)-1,2-Bis-hexadecylcarbamoyl-ethylcarbamoyl)-1-tert-butoxycarbonyl-ethylcarbamoyl]-pentanoic acid tert-butyl ester

7-[(S)-2-((S)-1,2-Bis-hexadecylcarbamoyl-ethylcarbamoyl)-1-tert-butoxycarbonyl-ethylcarbamoyl]-heptanoic acid tert-butyl ester