6-[(1S,2S)-2-((R)-3-Hydroxy-oct-1-ynyl)-5-oxo-cyclopentyloxy]-hexanoic acid

6-[(1S,2S,5R)-2-((S)-3-tert-Butoxy-oct-1-ynyl)-5-hydroxy-cyclopentyloxy]-hexanoic acid tert-butyl ester

6-[(1S,2S)-2-((S)-3-tert-Butoxy-oct-1-ynyl)-5-oxo-cyclopentyloxy]-hexanoic acid tert-butyl ester