TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The base is selected from sodium hydroxide or potassium hydroxide. The alkali metal sulfide, alkali metal bisulfide or alkaline metal sulfide in third step is selected from sodium hydrogen sulfide and sodium disulfide. The alkali metal salt of methylcyano carbamate is sodium methylcyano carbamate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The halogen in first step (a) is chlorine or bromine. The alcoholic solvent in second step is selected from methanol, ethanol or n-propanol. Preferred Method: The nitro group of 4-propylthio-2-nitroaniline is reduced in presence of a metal catalyst such as Raney nickel at hydrogen pressure of 10 kg/cm2 for 4-6 hours to obtain 4-propylthio-o-phenylenediamine (II). The condensation of 4-propylthio-o-phenylenediamine (II) with alkali or alkaline earth metal salt of methylcyano carbamate is carried out in presence of acetone and water as a solvent and in presence of a mineral acid (preferably concentrated hydrochloric acid) at a pH of 4-4.5. ACTIVITY - Antiparasitic; Antihelmintic.    MECHANISM OF ACTION - None given.    EXAMPLE - 2-Nitroaniline (360 kg) was treated with ammonium thiocyanate (407 kg) in methanol at room temperature. The reaction mixture was stirred and cooled to below 10 degrees C. Chlorine gas was purged for 6 hours and maintained for 1 hour. After completion of the reaction, water was added and stirred for 1 hour at 20 degrees C. The reaction mass was filtered, washed with water, and dried at 80 degrees C and after workup, 2-nitro-p-thiocyanoaniline (A1) was obtained. A suspension of (A1) (800 kg), water and n-propanol (2000 l) was made and caustic lye (700 kg) was added slowly to it below 35 degrees C. The reaction mass was heated to 40 degrees C, and n-propylbromide was added to it and further heated to 60 degrees C. After completion of the reaction, the reaction mass was subjected to distillation and even traces of n-propanol was distilled out under vacuum. After workup, 2-nitro-p-thiopropyl-aniline (A2) was obtained. Sodium hydrogensulfide (3200 l) was added slowly to a mixture of liquid (A2) (800 kg) and methanol (1600 l) at 50 degrees C and heated to reflux at 65-70 degrees C. After completion of the reaction, methanol was distilled out completely and the layers were separated. After workup, 4-propylthio-o-phenylenediamine (A3) was obtained. (A3) (400 kg) was treated with acetone (400 l). Then water (380 l) and concentrated HC1 (360 kg) was added to it. Exothermic reaction observed upto 48 degrees C. Reaction mass was cooled to room temperature and methyl-N-cyano carbamate was added. The reaction mass was heated to 80-85 degrees C. The pH was adjusted to 4-4.5 by concentrated HC1 and centrifuged. After workup, albendazole (500-520 kg) was obtained.