(4R,5R,6R)-6-(tert-Butyl-dimethyl-silanyloxy)-2,2,4-trimethyl-1,3-dioxa-spiro[4.4]nonan-7-one

tert-Butyl-dimethyl-((4R,5R,6S)-2,2,4-trimethyl-7-methylene-1,3-dioxa-spiro[4.4]non-6-yloxy)-silane