CAS No: 82230-93-1 |Erythromycin Impurity A (EP) , 3"-N-desmethylerythromycin A| Chemical Formula:: C37H67NO14 | (3R ,4 S ,5 S ,6 R ,7 R ,9 R ,11R ,12R ,13S ,14R )-4-[(2,6-dideoxy-3-C -methyl-3- O -methyl-α- L - ribo -hexopyranosyl)oxy]-14-ethyl-7,12,13-trihydroxy-3-(hydroxymethyl)-5,7,9,11,13-pentamethyl-6-[[3,4,6-trideoxy-3-(dimethylamino)-β-D -xylo -hexopyranosyl]oxy]oxacyclotetradecane-2,10-dione