(1S,2R,5S)-5-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-2-methyl-3-oxo-cyclopentanecarboxylic acid methyl ester

(1S,2R,3S,5S)-5-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-3-hydroxy-2-methyl-cyclopentanecarboxylic acid methyl ester