(3R,4R,5S,6R,9R,10S,11S,12R,15R)-12-[4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-6-ethyl-4,5-dihydroxy-10-(5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl)oxy-3,5,9,11,13,15-hexamethyl-7,16-dioxa-2-azabicyclo[11.2.1]hexadec-1-en-8-one