2,2-Dimethyl-propionic acid 2-{(2S,4R,6R)-6-[(E)-(R)-1-(tert-butyl-diphenyl-silanyloxy)-4-(tert-butyl-methoxy-phenyl-silanyloxy)-3-methyl-but-2-enyl]-2,4-dimethoxy-tetrahydro-pyran-2-ylmethyl}-oxazol-4-ylmethyl ester

2,2-dimethylpropionic acid 2-{(2S,4R,6R)-6-[(R)-(E)-1-(tert-butyldiphenylsilanyl-oxy)-4-(tert-butylmethoxyphenylsilanyloxy)-3-methyl-but-2-enyl]-4-hydroxy-2-methoxy-tetrahydropyran-2-ylmethyl}-oxazol-4-ylmethyl ester