(3aR,5R,7aS)-4'-((tert-butyldiphenylsilyl)oxy)-2,2-dimethyl-3a,3',4',7a-tetrahydro-4H,5'H-spiro[benzo[d][1,3]dioxole-5,2'-furan]-5'-one

5-(tert-butyldiphenylsilanyloxy)-6,7-O-isopropylidene-1-oxaspiro[2.5]octane