| abstract |
A novel photosensitizer used for photodynamic therapy and a method for preparing the same. A 9-hydroxypheophorbide-a derivative represented by the following general formula (I), which is a pharmaceutically acceptable salt or an acid addition salt, as a photosensitizer used for photodynamic therapy. Embedded image (In the formula, R 1 and R 2 are each independently hydrogen, a linear or branched alkyl group having 1 to 6 carbon atoms, or an aryl group having 3 to 8 carbon atoms.) |