Synonyms: Erythromycin E;1'',16-Epoxyerythromycin;AC1NUMUK;Erythromycin, 1'',16-epoxy-;(1R,4R,4'R,5S,5'S,6R,6'S,7R,9R,11R,12S,13S,14S,16S)-12-[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-4-ethyl-5,5',6,11-tetrahydroxy-4'-methoxy-4',5,6',7,9,11,13-heptamethylspiro[3,15,17-trioxabicyclo[12.4.0]octadecane-16,2'-oxane]-2,8-dione;41451-91-6