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2-Butenoic acid,4-hydroxy-2-methyl-,(3aR,4R,6S,6aS,9aR,9bR)-2,3,3a,4,5,6,6a,7,9a,9b-decahydro-6-(hydroxymethyl)-9-methyl-3-methylene-2-oxoazuleno[4,5-b]furan-4-ylester, (2E)- related products: