(1S,2'S,2S,3R,4'R,4R,5'S,6R,6'S,8R,9R,10S,11R,14R)-3-{[(3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-11-ethyl-4,5',9,10-tetrahydroxy-4'-methoxy-2,4,4',6,6',8,10-heptamethyl-3',4',5',6'-tetrahydrospiro[12,16,18-trioxabicyclo[12.4.0]octadecane-17,2'-pyran]-7,13-dione