(2R,3R)-2-Ethynyl-3-methyl-1,4-dioxa-spiro[4.5]decane

(S)-5-(tert-Butyl-dimethyl-silanyloxy)-4-methyl-1-((2R,3R)-3-methyl-1,4-dioxa-spiro[4.5]dec-2-yl)-pent-1-yn-3-one