DISHMAN PHARMACEUTICALS & CHEMICALS LTD. Bulk Drugs Bisacodyl Sodium Plusulphate , Thioridazine , Tramadol , Cetrimide Bulk Drugs Chemicals Phase Transfer Catalysts , Tetra Butyl Ammonium Bromide Benzyl Triethyl Ammonium Chloride 18-crown-6 Ethyl Triphenyl Ammonium Bromide Tetrabut