Resorcylic acid, resorcinolic acid, or carboxyresorcinol are names for a type of dihydroxybenzoic acid structurally related to resorcinol. They may refer to:
3,5-Dihydroxybenzoic acid (α-resorcylic acid or 5-carboxyresorcinol) 2,4-Dihydroxybenzoic acid (β-resorcylic acid or 4-carboxyresorcinol) 2,6-Dihydroxybenzoic acid (γ-resorcylic acid or 2-carboxyresorcinol) In each case, the hydroxyl groups are meta to each other and thus are m-dihydroxybenzoic acids. Carboxylates and esters of these compounds are called resorcylates or resorcinolates.
See also Resorcinolic lipid, non-fatty acid lipid derivatives of resorcinol