any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt

a crystalline derivative of benzoic acid

a crystalline acid found in the exudations of some conifers

a white crystalline substance with a bitter aftertaste; used as a fungicide or in making aspirin or dyes or perfumes

an acid found in many fruits; used in soft drinks and confectionery and baking powder

a dicarboxylic acid that is made by all living organisms, contributes to the sour taste of fruits, and is used as a food additive.