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Azithromycin EP Impurity N Azithromycin Impurity N(BP) 3'-Des(diMethylaMino)-3'-keto AzithroMycin Azithromycin Impurity 14（Azithromycin EP Impurity N） 3'-Des(dimethylamino)-3'-keto Azithromycin (Azithromycin EP Impurity N) Azithromycin EP Impurity N (3′-De(Dimethylamino)-3′-oxoazithromycin/ 3-Des(dimethylamino)-3-keto Azithromycin) (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-[[4,6-dideoxy-β-D-erythro-hexopyranos-3-ulos-1-yl]oxy]-13-[(2,6-dideoxy-3-C-Methyl-3-O-Methyl-α-L-ribo-hexopyranosyl)oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptaMe (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-13-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-11-[(2S,3S,6R)-3-hydroxy-6-methyl-4-oxooxan-2-yl]oxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one 1-Oxa-6-azacyclopentadecan-15-one, 11-[[4,6-dideoxy-β-D-erythro-hexopyranos-3-ulos-1-yl]oxy]-13-[(2,6-dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl)oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-, (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)- Azithromycin EP Impurity N/3’-De(dimethylamino)-3’-oxoazithromycin/(2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-[[4,6-dideoxy-β-D-erythro-hexopyranos-3-ulos-1-yl]oxy]-13-[(2,6-dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl)oxy]-2-ethyl-3,4,10-trihydroxy-