(3S,6R,7E,9R,10R,11R,12S,14aR)-11-[(2S,3R,4R,5S,6R)-5-acetamido-3,4-dihydroxy-6-methyloxan-2-yl]oxy-2,10,12,14,18-pentamethyl-8-[(E)-2-butyl-7-methyl-5,6,7,8,9,10,11,12,13,14,14a-