(1S,3R,4R,5S)-3-((R)-1-{(4R,5R,6S)-6-[(S)-but-3-yn-2-yl]-2,2,5-trimethyl-1,3-dioxan-4-yl}ethyl)-1,4-dimethyl-2,8-dioxabicyclo-[3.2.1]octane

(2R)-2-((4R,5S,6S)-6-((1R)-1-((1S,3R,4R,5S)-1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octan-3-yl)ethyl)-2,2,5-trimethyl-1,3-dioxan-4-yl)propanal