1,2-anhydro-4,5-dideoxy-4-[(1E,3E,6E)-8-(5,6-dimethoxy-3-methyl-4-oxo-1,4-dihydropyridin-2-yl)-2,6-dimethylocta-1,3,6-trien-1-yl]-2-methyl-1-(1-methylethyl)pentitol