(1S,2S,3R,6R,7S,8S,9R,10R,12R,15R)-3-ethyl-10-hydroxy-7-[(4S,6S)-5-hydroxy-4-methoxy-4,6-dimethyl-tetrahydropyran-2-yl]oxy-9-[(2S,3R)-3-hydroxy-6-methyl-4-oxo-tetrahydropyran-2-yl]oxy-2,6,8,10,12,15-hexamethyl-4,16-dioxa-14-azabicyclo[11.2.1]hexadec-13-en-5-oneErythromycin A 9,11-Imino EtherAzithromycin Impurity R161193-44-8V8TC4THK28Azithromycin Impurity R; Erythromycin A 9,11-Imino Ether(1R,2R,3R,6R,7S,8S,9R,10R,12R,15R)-7-[(2,6-Dideoxy-3-C-methyl-3-O-methyl-alpha-L-ribo-hexopyranosyl)oxy]-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15-hexamethyl-9-[[3,4,6-trideoxy-3-(dimethylamino)-beta-D-xylo-hexopyranosyl]oxy]-4,16-dioxa-14-azabicyclo[11.2.1]hexadec-13-en-5-one4,16-Dioxa-14-azabicyclo[11.2.1]hexadec-13-en-5-one, 7-[(2,6-dideoxy-3-C-methyl-3-O-methyl-alpha-L-ribo-hexopyranosyl)oxy]-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15-hexamethyl-9-[[3,4,6-trideoxy-3-(dimethylamino)-beta-D-xylo-hexopyranosyl]oxy]-, (1R,2R,3R,6R,7S,8S,9R,10R,12R,15R)-4,16-Dioxa-14-azabicyclo[11.2.1]hexadec-13-en-5-one, 7-[(2,6-dideoxy-3-C-methyl-3-O-methyl-alpha-L-ribo-hexopyranosyl)oxy]-3-ethyl-2,10-dihydroxy-2,6,8,10,12,15-hexamethyl-9-[[3,4,6-trideoxy-3-(dimethylamino)-beta-D-xylo-hexopyranosyl]oxy]-, [1R-(1R*,2R*,3R*,6R*,7S*,8S*,9R*,10R*,12R*,15R*)]-Erythromycin A 9,11-Imino Ether; (1R,2R,3R,6R,7S,8S,9R,10R,12R,15R)-9-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-3-ethyl-2,10-dihydroxy-7-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-2,6,8,10,12,15-hexamethyl-4,16-dioxa-14-azabicyclo[11.2.1]hexadec-13-en-5-one