(1R,5R,6R)-5-Methoxymethoxy-7-aza-bicyclo[4.1.0]hept-3-ene-3-carboxylic acid methyl ester

(3R,4S,5R)-5-Azido-4-methanesulfonyloxy-3-methoxymethoxy-cyclohex-1-enecarboxylic acid methyl ester

(1S,5S,6S)-5-Azido-7-trityl-7-aza-bicyclo[4.1.0]hept-2-ene-3-carboxylic acid methyl ester