(1R,5R,7S)-7-(tert-Butyl-dimethyl-silanyloxymethyl)-6,8-dioxa-bicyclo[3.2.1]oct-3-en-2-one

(+)-(1R,4S,5R,7S)-7-tert-butyldimethylsiloxymethyl-4-vinyl-6,8-dioxabicyclo[3.2.1]oct-2-one