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Chemical structures of selected ferulic acid dimers. (1): 8-5′-dehydrodiferulic acid (DiFA); (2): 8-8′-dehydrodiferulic acids; (3): 8-O-4′-dehydrodiferulic acid; (4): 5-5′-dehydrodiferulic acid; (5): 4-o-5′-dehydrodiferulicacid; (6): 8-8’-tetrahydrofuran (THF)-diferulic acid; (7): 8-8′-cyclic(c)-diferulic acid; (8): 8-5′-decarboxylated (dc)-diferulic acid; (9): 8-5′-cyclic-diferulic acid [58,59].
