Fig. 2.
The structure of 4-HB and its analogs that have been successfully used in COQ bypass reactions. (A) 4-HB, 4-hydroxybenzoate. (B) 2,4-diHB, 2,4-dihydroxybenzoate. (C) 3,4-diHB, 3,4-dihydroxybenzoate. (D) Vanillic acid
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