(1S,9R,11R,12R,13R,21R,23R,24R)-11-(tert-butyldimethylsilanyloxy)-24-(tert-butyldimethylsilanyloxymethyl)-23-(2-hydroxyethyl)-12,15,24-trimethyl-2,22,26-trioxatricyclo[19.3.1.19,13]-(4E,6E,14Z,16E,19E)-hexacosapentaen-3-one

(2R,3S,4S,6R)-6-[4-(benzothiazole-2-sulfonyl)-(E)-butenyl]-2-[2-(tert-butyldimethylsilanyloxy)ethyl]-3-(tert-butyldimethylsilanyloxymethyl)-3-methyltetrahydropyran-4-ol