A compound that, on administration, must undergo chemical conversion by biochemical (enzymatic), chemical (possibly following an enzymatic step), or physical (e.g. photochemical) activation processes before becoming the pharmacologically active herbicide for which it is a proherbicide.
Definition :
A compound which contains oxygen, at least one other element, and at least one hydrogen bound to oxygen, and which produces a conjugate base by loss of positive hydrogen ion(s) (hydrons).