4-Oxabicyclo[14.1.0]heptadecane-5,9-dione,7,11-dihydroxy-8,8,10,12,16-pentamethyl-3-[(1E)-1-methyl-2-(5-methyl-2-pyridinyl)ethenyl]-, (1S,3S,7S,10R,11S,12S,16R)-