(2R,4aR,5aS,6aR,8R,10S,10aS,11aR,13aS)-10-Benzyloxy-8-(3-benzyloxy-propyl)-2-[3-(tert-butyl-diphenyl-silanyloxy)-propyl]-11a-methyl-dodecahydro-1,5,7,11-tetraoxa-benzo[4,5]cyclohepta[1,2-b]naphthalen-3-one

methyl (4E,2S,3R)-3-acetoxy-2-benzamido-2-dimethylphenylsilylmethyl-6-(t-butyldiphenylsilyloxy)-4-hexenoate