Benzoic acid (1S,2R,3R)-2-benzyloxycarbonyl-3-formyl-2,3-dimethyl-cyclopentylmethyl ester

(1R,4R,7R)-1,7-Dimethyl-2-oxo-bicyclo[2.2.1]heptane-7-carboxylic acid benzyl ester

(1R,2R,5S)-2-Formyl-5-hydroxymethyl-1,2-dimethyl-cyclopentanecarboxylic acid benzyl ester

(1R,4S,7R)-2,3-Dihydroxy-1,7-dimethyl-bicyclo[2.2.1]heptane-7-carboxylic acid benzyl ester

(1R,4S,7R)-1,7-Dimethyl-2,3-dioxo-bicyclo[2.2.1]heptane-7-carboxylic acid benzyl ester