5-(acetyloxy)-8-[(acetyloxy)methyl]-1a,5-dimethyl-4,9-dioxo-1a,2,3,4,5,6,7,9,10a,10b-decahydrooxireno[9,10]cyclodeca[1,2-b]furan-7-yl (2E)-2-methylbut-2-enoate
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