9-(tert-butyldimethylsilyl) 1-methyl (4S,5S,6S,8R,E)-5-((tert-butyldimethylsilyl)oxy)-4,6,8-trimethylnon-2-enedioate

(3R,5R,6R)-6-((R)-2-Hydroxy-1-methyl-ethyl)-3,5-dimethyl-tetrahydro-pyran-2-one