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2-Butenoic acid,2-methyl-,(3R,3aR,4S,9aS,9bS)-2,3,3a,4,5,7,9a,9b-octahydro-3,6,9-trimethyl-2,7-dioxoazuleno[4,5-b]furan-4-ylester, (2Z)- related products: