[((3aR,4S,6S,6aS)-6-Hydroxymethyl-2,2-dimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyrrole-4-carbonyl)-amino]-acetic acid benzyl ester

(3aR,4S,6S,6aS)-4-(Benzyloxycarbonylmethyl-carbamoyl)-6-hydroxymethyl-2,2-dimethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyrrole-5-carboxylic acid tert-butyl ester

(1R,2R,3S,4S,4'R,5'R)-4',5'-diphenylspiro[2,3-exo-isopropylidenedioxy-7-tert-butoxycarbonyl-7-azabicyclo[2.2.1]hept-2,2'-imidazoline]

(+)-(1R,2S,3R,4S,5R,6S)-7-tert-butoxycarbonyl-2,3-exo-isopropylidenedioxy-6-endo-p-toluenesulfonyl-7-azabicyclo[2.2.1]heptane-5-endo-ol