N-((1R,2S,3S,4S,6S)-2-(benzyloxy)-4-(dimethoxymethyl)-3-((R)-1-hydroxy-3-(trimethylsilyl)prop-2-yn-1-yl)-6-methyl-7-oxabicyclo[4.1.0]heptan-3-yl)-2,2,2-trichloroacetamide

(1R)-1-((1R,2S,3S,6S)-2-(benzyloxy)-4-(dimethoxymethyl)-6-methyl-3-(2,2,2-trichloroacetamido)-7-oxabicyclo[4.1.0]heptan-3-yl)prop-2-yn-1-yl acetate