Acetic acid (1S,5R,6R)-5-(tert-butyl-dimethyl-silanyloxy)-4-(tert-butyl-dimethyl-silanyloxymethyl)-2-oxo-7-oxa-bicyclo[4.1.0]hept-3-en-3-ylmethyl ester

Acetic acid (1aR,2S,7R,7aR)-7-(tert-butyl-dimethyl-silanyloxy)-6-oxo-4-propyl-2,6,7,7a-tetrahydro-1aH-1,5-dioxa-cyclopropa[b]naphthalen-2-yl ester

(1R,2S,5R,6R)-5-(tert-Butyl-dimethyl-silanyloxy)-4-(tert-butyl-dimethyl-silanyloxymethyl)-3-((E)-pent-1-enyl)-7-oxa-bicyclo[4.1.0]hept-3-en-2-ol

Acetic acid (1R,2S,5R,6R)-5-(tert-butyl-dimethyl-silanyloxy)-4-(tert-butyl-dimethyl-silanyloxymethyl)-3-((E)-pent-1-enyl)-7-oxa-bicyclo[4.1.0]hept-3-en-2-yl ester

Acetic acid (1R,2S,5R,6R)-5-(tert-butyl-dimethyl-silanyloxy)-4-hydroxymethyl-3-((E)-pent-1-enyl)-7-oxa-bicyclo[4.1.0]hept-3-en-2-yl ester

(2R,3R,7R,11S)-3-{[tert-butyl(dimethyl)silyl]oxy}-7-propyl-1,6-dioxatricyclo[8.1.0.04,9]undec-4(9)-ene-5,10-dione

(1R,2S,5R,6R)-5-(tert-Butyl-dimethyl-silanyloxy)-4-(tert-butyl-dimethyl-silanyloxymethyl)-3-hydroxymethyl-7-oxa-bicyclo[4.1.0]hept-3-en-2-ol