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2-Butenoic acid,2-methyl-,(3aR,4R,6S,6aR,9S,9aS,9bS)-2,3,3a,4,5,6,6a,9,9a,9b-decahydro-6,6a,9-trihydroxy-6,9-dimethyl-3-methylene-2-oxoazuleno[4,5-b]furan-4-ylester, (2Z)-rel-(+)- related products: