methyl <2E,4E,6R*<1S*-<1α,3α,4β,5α,8β>>>-4-methyl-6-(6-oxo-1,4,8-trimethyl-2,9-dioxabicyclo<3.3.1>non-6-en-3-yl)hepta-2,4-dionate

(2E,4E)-(R)-4-Methyl-6-((1S,3R,4R,5S)-1,4,8-trimethyl-6-oxo-2,9-dioxa-bicyclo[3.3.1]non-7-en-3-yl)-hepta-2,4-dienoic acid methyl ester