(E)-2'-O-4''-O-diformyl-9-deoxo-9-methoxyiminoerythromycin A

12-[2-(dimethylamino)ethoxymethoxy]-6-[4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-14-ethyl-7,13-dihydroxy-4-(5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl)oxy-10-methoxyimino-3,5,7,9,11,13-hexamethyl-oxacyclotetradecan-2-one