Abstract: A method for the treatment or prevention of a cell or tissue damage in a living subject due to the exposure to ionizing radiation is provided, which comprises administration to said subject of a compound of formula (I) wherein R? is H, OH, CONH2 or COCH3, R? is H or CH3, R?? is H or CH3, and X? is a pharmaceutically acceptable counterion, in an amount sufficient to inhibit radiation-induced damage.