(E)-(2R,3S,4R)-4-(tert-Butyl-dimethyl-silanyloxy)-1,7-bis-(4-methoxy-benzyloxy)-hept-5-ene-2,3-diol

{(2R,3R)-3-[1-((2R,3R)-3-Allyl-1,4-dioxa-spiro[4.4]non-2-yl)-vinyl]-1,4-dioxa-spiro[4.4]non-2-yl}-methanol

((2R,3R)-3-{1-[(2R,3R)-3-prop-2-yn-1-yl-1,4-dioxaspiro[4.4]non-2-yl]vinyl}-1,4-dioxaspiro[4.4]non-2-yl)methanol

((2R,3R)-3-{1-[(2R,3R)-3-(tert-Butyl-dimethyl-silanyloxymethyl)-1,4-dioxa-spiro[4.4]non-2-yl]-vinyl}-1,4-dioxa-spiro[4.4]non-2-yl)-methanol