(2E,10E,12E,16Z,18E)-(5S,6R,7S,9S,15R)-6-(tert-Butyl-dimethyl-silanyloxy)-17-ethyl-1-hydroxy-19-((2S,3S)-6-hydroxy-3-methyl-3,6-dihydro-2H-pyran-2-yl)-3,5,7,11,15-pentamethyl-9-triisopropylsilanyloxymethyl-nonadeca-2,10,12,16,18-pentaen-8-one