(5R,6R,7S)-9-Iodo-2,2-dimethyl-1,3-dioxa-spiro[4.4]non-8-ene-6,7-diol

(5R,8S,9R)-6-Iodo-8,9-bis-methoxymethoxy-1,3-dioxa-spiro[4.4]non-6-en-2-one

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

(5R,8S,9R)-8,9-Bis-(tert-butyl-dimethyl-silanyloxy)-6-iodo-1,3-dioxa-spiro[4.4]non-6-en-2-one

(5R,8S,9R)-8,9-Bis-(tert-butyl-dimethyl-silanyloxy)-6-iodo-2,2-dimethyl-1,3-dioxa-spiro[4.4]non-6-ene