(E)-3-[(1S,2R,5S,6S)-5-(tert-Butyl-dimethyl-silanyloxy)-2-hydroxy-7-oxa-bicyclo[4.1.0]hept-3-en-3-yl]-acrylic acid methyl ester

(1R,5S,6R)-5-hydroxy-3-(3-methylbut-3-en-1-yn-1-yl)-7-oxabicyclo[4.1.0]hept-3-en-2-one

(2R,3S,4S)-4-tert-butyldimethylsilyloxy-2,3-epoxy-6-hydroxymethyl-5-cyclohexen-1-one

(2R,3S,4S)-4-[(tert-Butyldimethylsilyl)oxy]-2,3-epoxy-6-(3-methylbut-3-en-1-ynyl)-5-cyclohexen-1-one