8-Bromo-7-(tert-butyl-diphenyl-silanyloxymethyl)-10-(2-hydroxy-ethyl)-1,5-dioxa-spiro[5.5]undeca-7,10-dien-9-one

(1S,6R)-4-bromo-3-(((tert-butyldiphenylsilyl)oxy)methyl)-6-(2-hydroxyethyl)-7-oxaspiro[bicyclo[4.1.0]heptane-2,2'-[1,3]dioxan]-3-en-5-one