A compound comprising a water soluble salt of formula (I) wherein R1 is a C1-10alkyl group; or a C2-10a1kenyl group; M is a cation of valency n, providedthat when R1 is a pent-2-enyl group, Mn+ is other than sodium or potassium.These salts are particularly suitable for use in agricultural formulations.The formulations may further comprise benzoic acid derivatives and/orantioxidants.