A new convenient method for the preparation of heterocyclic bis-derivative of benzimidazole with ftorotan with 18-crown-6-complex as catalyst was described. The structure and composition of the synthesized compound has been confirmed by data of elemental analysis, UV-, IR- and NMRІН-spectra. It was discovered that compound which synthesized and their molecular complex with bacterial lectine Bacillus polymyxa 102 KGU are considered as average toxic preparations. A strong antitumour effect of bis-derivative of benzimidazole on the heterotransplants of human glioma-cancer with 43.8 % growth inhibition of cancer has been discovered. A strong antitumour effect of molecular complex (bis-heterocycle — bacterial lectine) on Lymphosarcoma Plissa tumour with 80,0 % growth inhibition of tumour mass has been registered.
