(S)-3-(N'-tert-Butoxycarbonyl-hydrazinocarbonyl)-2-{(R)-2-[(9H-fluoren-9-ylmethoxycarbonyl)-methyl-amino]-propionyl}-tetrahydro-pyridazine-1-carboxylic acid benzyl ester

(S)-3-[(1R,2S)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methoxycarbonyl-propylcarbamoyl]-2-{(R)-2-[(9H-fluoren-9-ylmethoxycarbonyl)-methyl-amino]-propionyl}-tetrahydro-pyridazine-1-carboxylic acid benzyl ester

(S)-3-(N'-tert-Butoxycarbonyl-hydrazinocarbonyl)-2-((R)-2-methylamino-propionyl)-tetrahydro-pyridazine-1-carboxylic acid benzyl ester

(S)-2-[(R)-2-({(S)-2-[Benzyloxy-((R)-1-benzyloxycarbonyl-hexahydro-pyridazine-3-carbonyl)-amino]-propionyl}-methyl-amino)-propionyl]-tetrahydro-pyridazine-1,3-dicarboxylic acid 3-benzhydryl ester 1-benzyl ester

2-((9H-fluoren-9-yl)methyl) 1-benzyl (R)-3-(((S)-1-(((R)-1-((S)-6-((benzhydryloxy)carbonyl)-2-((benzyloxy)carbonyl)tetrahydropyridazin-1(2H)-yl)-1-oxopropan-2-yl)(methyl)amino)-1-oxopropan-2-yl)(benzyloxy)carbamoyl)tetrahydropyridazine-1,2-dicarboxylate