(1S,2R,5S,7R,9R,10S,14R,15S,19S)-7-{[(2R,3R,4R,5S,6S)-3,4,5-trimethoxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-15-{[(2R,5S,6R)-5-(dimethylamino)-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-19-ethyl-14-methyl-20-oxatetracyclo[10.10.0.02,10.05,9]docosa-3,11-diene-13,21-dione