(2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13-{[(2R,4R,5S)-5-hydroxy-4-methoxy-4,6-dimethyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-11-{[(2S,3R,4S)-4-(dimethylamino)-3-hydroxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-2-ethyl-3,4,10-trihydroxy-3,5,8,10,12,14-hexamethyl-6-nitroso-6-aza-1-oxacyclopentadecan-15-one