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methyl (3E,3aR,4aR,6R,7R,7aR,9aR,9bR)-3-ethylidene-6-hydroxy-2-oxo-3,3a,6,7,7a,9b-hexahydro-2H,4aH-1,4,5-trioxadicyclopenta[a,hi]indene-7-carboxylate related products: