(3R,5R)-5-(tert-Butyl-dimethyl-silanyloxy)-tetrahydro-pyridazine-1,2,3-tricarboxylic acid 1,2-di-tert-butyl ester 3-methyl ester

(3R,5R)-5-(tert-Butyl-dimethyl-silanyloxy)-tetrahydro-pyridazine-1,3-dicarboxylic acid 3-methyl ester 1-(2-trimethylsilanyl-ethyl) ester

(3R,5R)-3-{(S)-1-[(1R,2S)-1-Allyloxycarbonyl-2-(tert-butyl-dimethyl-silanyloxy)-propylcarbamoyl]-3-methyl-butylcarbamoyl}-5-(tert-butyl-dimethyl-silanyloxy)-tetrahydro-pyridazine-1-carboxylic acid 2-trimethylsilanyl-ethyl ester

allyl O-(tert-butyldimethylsilyl)-N-(((3R,5R)-5-((tert-butyldimethylsilyl)oxy)-2-((S)-3-methyl-2-((((2,2,2-trichloroethoxy)carbonyl)-D-valyl)oxy)butanoyl)hexahydropyridazine-3-carbonyl)-L-leucyl)-D-threoninate

3-{1-[1-allyloxycarbonyl-2-(tert-butyl-dimethyl-silanyloxy)-propylcarbamoyl]-3-methyl-butylcarbamoyl}-5-(tert-butyl-dimethyl-silanyloxy)-2-(2-hydroxy-3-methyl-butyryl)-tetrahydro-pyridazine-1-carboxylic acid 2-trimethylsilanyl-ethyl 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-(tert-Butyl-dimethyl-silanyloxy)-tetrahydro-pyridazine-1,3-dicarboxylic acid 1-(2-trimethylsilanyl-ethyl) ester