N-DEMETHYLROXITHROMYCIN (9E)-9-[O-[(2-Methoxyethoxy)Methyl]oxiMe]-N-deMethyl ErythroMycin (E)-N-DeMethylroxithroMycin RU 44981 Roxithromycin Impurity 6(Roxithromycin EP Impurity F) Roxithromycin Impurity F Roxithromycin Impurity R Roxithromycin EP Impurity F/(3R,4S,5S,6R,7R,9R,11S,12R,13S,14R,E)-4-(((2R,4R,5S,6S)-4,5-dihydroxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-6-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-14-ethyl-7,12,13-trihydroxy-10-