2-[(4R,5S)-6-Benzyloxy-2-(tert-butyl-dimethyl-silanyloxy)-4-hydroxy-5-methyl-hexyl]-pyran-4-one

(2R,6S,8R)-8-((S)-2-Benzyloxy-1-methyl-ethyl)-10-(tert-butyl-dimethyl-silanyloxy)-2-vinyl-1,7-dioxa-spiro[5.5]undecan-4-one