IN WHICH R1 AND R2 REPRESENT HYDROGEN, HALOGEN, LOWER ALKYL OR ALKOXY, CARBOXY, CARBAMOYL, LOWER CARBALKOXY, CARBOBENZOXY, SULFOXY OR SULFAMOUL; R3 REPRESNETS HYDROGEN OR LOWER ALKYL HAVING 1 TO 3 CARBON ATOMS, R4 REPRESENTS AN ALKYL RADICAL HAVING 1 TO 12 CARBON ATOMS, WHICH MAY CARRY ONE OR SEVERAL HYDROXY, LOWER ALKOXY, CARBOXY, LOWER CARBALKOXY, CARBAMOYL, NITRILE, SULFO, LOWER SULFALKOXY AND/OR SULFAMOYL GROUPS, AND X REPRESENTS THE ANION OF A NON-TOXIC ACID, WHICH COMPOUNDS HAVE BACTERIOSTATIC PROPERTIES.