(2-Hydroxy-ethyl)-[(S)-1-propyl-6-(tetrahydro-pyran-2-yloxy)-hexyl]-carbamic acid tert-butyl ester

(Z)-(S)-5-Ethyl-15-oxo-1-oxa-4-aza-cyclopentadec-10-ene-4-carboxylic acid tert-butyl ester

(5S,10Z)-4-[(tert-butoxy)carbonyl]-5-propyl-1-oxa-4-azacyclopent-10-en-15-one

(Z)-(S)-11-[(2-Acetoxy-ethyl)-tert-butoxycarbonyl-amino]-tridec-5-enoic acid

Acetic acid 2-{tert-butoxycarbonyl-[(S)-1-ethyl-6-(tetrahydro-pyran-2-yloxy)-hexyl]-amino}-ethyl ester