[(4r,4ar,5s,7r,8s,8ar)-4,5-dihydroxy-4-(hydroxymethyl)-7,8-dimethyl-8-[2-(5-oxo-2h-furan-3-yl)ethyl]-2,3,5,6,7,8a-hexahydro-1h-naphthalen-4a-yl]methyl (e)-2-methylbut-2-enoate
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