2,2-Dimethyl-propionic acid (S)-4-[(3R,4S)-3-(tert-butyl-diphenyl-silanyloxy)-4-(4-methoxy-benzyloxy)-5-oxo-cyclopent-1-enyl]-2-(R)-1,4-dioxa-spiro[4.4]non-2-yl-2-hydroxy-but-3-ynyl ester

2,2-Dimethyl-propionic acid (S)-4-[(3R,4S,5R)-3-(tert-butyl-diphenyl-silanyloxy)-5-hydroxy-4-(4-methoxy-benzyloxy)-5-prop-2-ynyl-cyclopent-1-enyl]-2-(R)-1,4-dioxa-spiro[4.4]non-2-yl-2-triethylsilanyloxy-but-3-ynyl ester

(1R,4S,5R)-4,5-Bis-(tert-butyl-dimethyl-silanyloxy)-1-hydroxymethyl-2-iodo-cyclopent-2-enol