(1R,2R,3R,5R,6R)-2-azido-3-(2-cyclopentenyloxy)-6-fluorobicyclo[3.1.0]hexane-2,6-dicarboxylic acid 2-benzyl 6-ethyl ester

(-)-(1R,2S,3R,5R,6R)-6-fluoro-2,3-dihydroxybicyclo[3.1.0]hexane-2,6-dicarboxylic acid 2-benzyl 6-ethyl ester

(1R,2R,3R,5R,6R)-2-Amino-6-fluoro-3-methoxy-bicyclo[3.1.0]hexane-2,6-dicarboxylic acid 6-ethyl ester

(1R,2R,3R,5R,6R)-2-amino-3-cyclopentyloxy-6-fluorobicyclo[3.1.0]hexane-2,6-dicarboxylic acid 2-benzyl 6-ethyl ester

(-)-(1R,2R,3R,5R,6R)-2-azido-6-fluoro-3-hydroxybicyclo[3.1.0]hexane-2,6-dicarboxylic acid 2-benzyl 6-ethyl ester