10,10-dimethyl-9,11-dioxabicyclo<6.3.0>undec-4-ene

1-[5'-(tert-butyl-dimethyl-silanyloxymethyl)-octahydro-[2,2']bifuranyl-5-yl]-undecan-1-ol

(2R,2R',5R, 5R')-[5-(5'-(tert-butyldimethylsilyloxy)methyltetrahydrofuran-2'-yl)tetrahydrofuran-2-yl]methanol