(5S,6S,7R,8R,9S,10S)-5,6-dihydroxy-7,9:8,10-di-O-isopropylidene-7,8,9,10-tetraoxotridecanoic acid tert-butyl ester

(5Z,7R,8R,9S,10S)-7,9:8,10-di-O-isopropylidene-7,8,9,10-tetraoxotridec-5-enoic acid tert-butyl ester

(5Z,7R,8R,9S,10R)-7,8:9,10-di-O-isopropylidene-7,8,9,10-tetraoxotridec-5-enoic acid tert-butyl ester

(4R,5R,6aS)-5-(tert-Butyl-dimethyl-silanyloxy)-4-[(E)-3-(tert-butyl-dimethyl-silanyloxy)-oct-1-enyl]-2-(4-methoxycarbonyl-butyl)-1,2,4,5,6,6a-hexahydro-pentalene-2-carboxylic acid methyl ester