3,5-Dihydroxybenzoic acid

It is a colorless solid.

It is prepared by disulfonation of benzoic acid followed by hydrolysis of the disulfonate.

[3] It is a metabolite of alkylresorcinols, first identified in human urine[4] and can be quantified in urine[5] and plasma,[6] and may be an alternative, equivalent biomarker of whole grain wheat intake.

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Chemical structure of 3,5-dihydroxybenzoic acid
Chemical structure of 3,5-dihydroxybenzoic acid