(2S,3R,4S)-4-[(2S,5R,7S,8R,9S)-2-{(2S,2'R,3'S,5R,5'R)-2-Ethyl-5'-[(2S,3S,5R,6R)-6-hydroxy-6-(hydroxymethyl)-3,5-dimethyltetrahydro-2H-pyran-2-yl]-3'-methyloctahydro-2,2'-bifuran-5-yl}-9-hydroxy-2,8-di
methyl-1,6-dioxaspiro[4.5]dec-7-yl]-3-methoxy-2-methylpentanoic acid