(5R, 6S)-6-endo-dimethoxymethyl-7-exomethyl-2-oxabicyclo<3.2.1>-3-octanone

(1R, 2S, 3R, 4R)-2-(dimethoxymethyl)-4-hydroxyl-3-methyl-1-cyclopentane acetic acid methyl ester

(1R, 2S, 3R, 4R)-4-benzoyloxy-2-(dimethoxymethyl)-3-methyl-1-cyclopentaneacetic acid methyl ester

(1R,2R,3S,4S)-3-methyl-5-norbornene-2-methanol