(Z)-4-{(2R,6R)-6-[(7E,12E)-(2R,10R,11S)-11-(tert-Butyl-dimethyl-silanyloxy)-6-hydroxy-10-(4-methoxy-benzyloxy)-2-methyl-13-((S)-4-methyl-3,6-dihydro-2H-pyran-2-yl)-4-oxo-trideca-7,12-dienyl]-5,6-dihydro-2H-pyran-2-yl}-but-2-enoic acid methyl ester

(Z)-4-{(2R,6R)-6-[(7E,12E)-(2R,10R,11S)-6,11-Bis-(tert-butyl-dimethyl-silanyloxy)-10-(4-methoxy-benzyloxy)-2-methyl-13-((S)-4-methyl-3,6-dihydro-2H-pyran-2-yl)-4-oxo-trideca-7,12-dienyl]-5,6-dihydro-2H-pyran-2-yl}-but-2-enoic acid methyl ester

11-(tert-butyl-dimethyl-silanyloxy)-7-[1-(tert-butyl-dimethyl-silanyloxy)-3-(4-methyl-3,6-dihydro-2H-pyran-2-yl)-allyl]-15-methyl-13-methylene-6,21-dioxa-bicyclo[15.3.1]henicosa-3,9,19-trien-5-one