(1R,2S,3R,6E,8S,9S,10S,12R,14E,16R)-9-[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyl-oxan-2-yl]oxy-3-ethyl-2-hydroxy-2-[[(2R,3R,4R,5R,6R)-5-hydroxy-3,4-dimethoxy-6-methyl-oxan-2-yl]oxymethyl]-8,10,12-trimethyl-4,17-dioxabicyclo[14.1.0]heptadeca-6,14-diene-5,13-dione