benzyl ((2S,3R,4S,6R)-2-(((2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,6S)-4-methoxy-4,6-dimethyl-5-oxotetrahydro-2H-pyran-2-yl)oxy)-3,5,8,10,12,14-hexamethyl-15-oxo-1-oxa-6-azacyclopentadecan-11-yl)oxy)-6-methyl-4-(methyl(nitroso)amino)tetrahydro-2H-pyran-3-yl) carbonate
