(2R,3aR,8aR)-3a-Triethylsilanyloxy-1,2,3,3a,8,8a-hexahydro-pyrrolo[2,3-b]indole-2-carboxylic acid allyl ester

3-(tert-butyl-dimethyl-silanyloxy)-2-{2-[(5-(tert-butyl-dimethyl-silanyloxy)-2-{3-methyl-2-[3-methyl-2-(2,2,2-trichloro-ethoxycarbonylamino)-butyryloxy]-butyryl}-hexahydro-pyridazine-3-carbonyl)-amino]-4-methyl-pentanoylamino}-butyric acid

(3R,5R)-5-Hydroxy-hexahydro-pyridazine-3-carboxylic acid methyl ester

N-Troc-D-valine

(R)-2-(1,2-bis(tert-butoxycarbonyl)hydrazineyl)pent-4-enoic acid