Josamycin
(2S,3S,4R,6S) -6- {[(2R,3S,4R,5R,6S) -6- {[(4R,5S,6S,7R,9R,10R,11E,13E,16R) -4- (acetyloxy)-10-hydroxy-5-methoxy-9, 16-dimethyl-2-oxo-7-(2-oxoethyl)-1-oxacyclohexadeca-11, 13-dien-6-yl]oxy}-4-(dimethylamino)-5-hydroxy-2-methyloxan-3-yl]oxy}-4-hydroxy-2, 4-dimethyloxan-3-yl 3-methylbutanoate