(1Z,3R,4S,5R,8R,9S,10S,11R,12R,14R)-9-{[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-11-{[(2R,3S,4R,6S)-4-(dimethylamino)-3-hydroxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-5-ethyl-3,4-dihydroxy-2,4,8,10,12,14-hexamethyl-6,15-dioxabicyclo[10.2.1]pentadec-1(2)-en-7-one