(2R,3S,5R)-5-Carboxymethyl-3-hydroxy-pyrrolidine-2-carboxylic acid 4-nitro-benzyl ester

(2R,3S,5R)-5-Methoxycarbonylmethyl-3-(2-methoxy-ethoxymethoxy)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-(4-nitro-benzyl) ester

(-)-menthyl 3,5-hexadienoate

p-nitrobenzyl <4(S)-(3-carbomenthyloxy-2-propen-1-yl)azetidin-2-on-1-yl>triphenylphosphoranylideneacetate

4(S)-(3-carbomenthyloxy-2-propen-1-yl)-2-azetidinone