(3S,3aR,5aS,7S,8aR,8bS)-2-[(2R,3S,7S)-3-(tert-butyldiphenylsiloxy)-7-hydroxy-2-methylnonanoyl]-7-[(6-deoxy-2,3,4-tri-O-methyl-α-L-mannopyranosyl)oxy]-3,3a,5a,6,7,8,8a,8b-octahydro-as-indacene-3-acetic acid κ-lactone

2,2-Dimethyl-propionic acid (2R,3aS,5aR,6S,8aS,8bR)-7-[(2R,3S,7S)-7-(tert-butyl-dimethyl-silanyloxy)-3-(tert-butyl-diphenyl-silanyloxy)-2-methyl-nonanoyl]-6-[2-(4-methoxy-benzyloxy)-ethyl]-1,2,3,3a,5a,6,8a,8b-octahydro-as-indacen-2-yl ester