(8R,9R,9aS)-8-(tert-Butyl-dimethyl-silanyloxy)-9-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-octahydro-pyrrolo[1,2-a]azepin-3-one

Methanesulfonic acid (4R,5R,6S)-4,7-bis-(tert-butyl-dimethyl-silanyloxy)-6-methyl-5-((S)-5-oxo-pyrrolidin-2-yl)-heptyl ester

(8R,9R,9aS)-8-(tert-Butyl-dimethyl-silanyloxy)-9-((S)-2-hydroxy-1-methyl-ethyl)-octahydro-pyrrolo[1,2-a]azepin-3-one

(4S,5R,6R)-4-Azido-9-benzyloxy-6-(tert-butyl-dimethyl-silanyloxy)-5-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-nonanoic acid

(4S,5R,6R)-4-Azido-9-benzyloxy-6-(tert-butyl-dimethyl-silanyloxy)-5-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-nonanoic acid methyl ester