[(3aR,5S,6aR)-5-[(R)-1,2-Bis-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2,2-dimethyl-dihydro-furo[2,3-d][1,3]dioxol-(6E)-ylidene]-acetic acid methyl ester

Methanesulfonic acid 2-[(3aR,5S,6aR)-5-[(R)-1,2-bis-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2,2-dimethyl-dihydro-furo[2,3-d][1,3]dioxol-(6E)-ylidene]-ethyl ester