Novel drug form of chlorin e6

A novel stable water-soluble form of well known photosensitizer chlorin e 6 named `Photodithazine' has been obtained from Spirulina Platensis cyanobacteria as a noncovalent complex with N-methyl-D-glucosamine, and its biological characteristics evaluate, which proved to be as follows: in vitro photocytotoxicity was 1 (mu) M (EC 50 ) as determined by the extent of DNA synthesis inhibition in CaOv cells after irradiation with 650 - 900 nm light, and 5 (mu) M (EC 65 ) as determined using MTT test on PC12 cells after irradiation with 670 nm laser light at the doses of 15 and 20 J/cm 2 , respectively, with Al-sulfophthalocyanine `Photosense' (Russia) and oligomerized hematoporphyrin-IX mixture `Photogen' (Russia) being used as permitted reference drugs.