USP命名:Azithromycin C (3″-O-demethylazithromycin)k;(2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13-((4,5-dihydroxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-11-((4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one;
Roxithromycin EP Impurity C (Erythromycin A 9-Oxime (E-Isomer));USP命名:Erythromycin A oximej;(3R,4S,5S,6R,7R,9R,11S,12R,13S,14R,E)-6-(((3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-14-ethyl-7,12,13-trihydroxy-4-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-10-(hydroxyimino)-3,5,7,9,11,13-hexamethyloxacyclotetradecan-2-one;