A halogenated benzamide derivative characterized by greater specificity forviral pathogens and less disruptive to beneficial gut microflora, according toformula (III): in which R1 is a halogen atom, and R2 -R6 are independentlyhydrogen, hydroxyl, C1 -C4 alkyl, -C1-C4 alkoxy, acyloxy, nitro, halogen, -C(O)R7 where R7 is -C1-C4 alkyl, or aromatic including salts and hydrates ofthese compounds.