(3R,4R,5R)-5-tert-butyldimethylsiloxy-3,4-O-isopropylidenedioxy-1-cyclohexene

(1S,2S,3R,4R,5R)-5-tert-butyldimethylsiloxy-1,2-epoxy-3,4-(O-isopropylidenedioxy)cyclohexane

(1S,2S,3S,4R,4aR,5R,6S,7S,8aR)-2-bromo-3,5-epoxy-6,7-(O-isopropylidenedioxy)perhydro-endo-1,4-methanonaphthalen-8-one

(1R,2S,4S,5S,6R,7R,8R,9S,10S)-6,9-epoxy-4,5-(O-isopropylidenedioxy)tetracyclo[6.2.1.02,7.02,10]undecan-3-one

(1R,2S,4S,5S,6R,7R,8R,9S,10S)-4-benzyl-6,9-epoxy-4,5-(O-isopropylidenedioxy)tetracyclo[6.2.1.02,7.02,10]undecan-3-one