4,​16-​Dioxa-​14-​azabicyclo[11.2.1]​hexadec-​13-​en-​5-​one, 7-​[(2,​6-​dideoxy-​3-​C-​methyl-​3-​O-​methyl-​α-​L-​ribo-​hexopyranosyl)​oxy]​-​3-​ethyl-​2,​10-​dihydroxy-​2,​6,​8,​10,​12,​15-​hexamethyl-​9-​[[3,​4,​6-​trideoxy-​3-​(dimethylamino)​-​β-​D-