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

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

(2R,3S)-2-((S)-2-Amino-4-methyl-pentanoylamino)-3-(tert-butyl-dimethyl-silanyloxy)-butyric acid allyl ester

(S)-2-(9H-Fluoren-9-ylmethoxycarbonyloxy)-3-methyl-butyric acid allyl ester