(Z)-(R)-8-(tert-Butyl-dimethyl-silanyloxy)-4-hydroxy-6-(4-methoxy-benzyloxy)-1-((2R,4S,6R)-2-phenyl-6-triisopropylsilanyloxymethyl-[1,3]dioxan-4-yl)-oct-3-en-2-one

[(2S,4S,6R,8R,10S)-4-Methoxy-10-(4-methoxy-benzyloxy)-8-triisopropylsilanyloxymethyl-1,7-dioxa-spiro[5.5]undec-2-yl]-acetaldehyde