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A) Three step protocol utilized to synthesize benzoic acid 4-sulfate (3a), isovanillic acid 3-sulfate (3b), and vanillic acid 4-sulfate (3c). Starting material: 4-hydroxy benzoic acid (1a), isovanillic acid (1b), and vanillic acid (1c). B) Structures of benzoic acid 4-sulfate, isovanillic acid 3-sulfate, and vanillic acid 4-sulfate.
