(8E,10E,14Z,16E)-(3S,4R,5S,7R,13R)-15-Ethyl-4-hydroxy-17-((2R,6R)-6-isopropoxy-3,6-dihydro-2H-pyran-2-yl)-3,5,7,9,13-pentamethyl-heptadeca-8,10,14,16-tetraen-6-one