(2R)-ethynyl-(6R)-methyl-4-methylene-tetrahydropyran-(3S)-ol

(5R)-ethynyl-(7R)-methyl-1,6-dioxa-spiro[2,5]octan-(4R)-ol

(4R)-triethylsilyloxy-(5R)ethynyl-(7R)-methyl-1,6-dioxa-spiro[2,5]octane

(2R,3S,6R)-6-(tert-Butyl-dimethyl-silanyloxymethyl)-2-((E)-2-iodo-vinyl)-4-methylene-3-triisopropylsilanyloxy-tetrahydro-pyran

Acetic acid (Z)-(S)-3-{(2R,3R,5S,6S)-2,5-dimethyl-6-[(2E,4E)-3-methyl-5-((3R,4R,5R,7S)-7-methyl-4-triethylsilanyloxy-1,6-dioxa-spiro[2.5]oct-5-yl)-penta-2,4-dienyl]-tetrahydro-pyran-3-ylcarbamoyl}-1-methyl-allyl ester