Erythromycin E
Erythromycin IMP (2S,4’R,4aR,5’S,6’S,7R,8S,9R,10R,12R,14R,15S,16S,16aS)- 15-{[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6- methyloxan-2-yl]oxy}-7-ethyl-5′,8,9,14- tetrahydroxy-4′-methoxy-4′,6′,8,10,12,14,16- heptamethyl-tetradecahydrospiro[[1,3]dioxino[5,4- c]oxacyclotetr