A dihydroxybenzoic acid having the two hydroxy groups at the 2- and 5-positions. ChEBI: 2,5-dihydroxybenzoic acid is a dihydroxybenzoic acid having the two hydroxy groups at the 2- and 5-positions. It has a role as a MALDI matrix material, an EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor, a human metabolite, a fungal metabolite and a mouse metabolite. It is functionally related to a benzoic acid. It is a conjugate acid of a 2,5-dihydroxybenzoate.