E. Lukevics, L. Ignatovich, T. Shul'ga, O. Mitchenko, and S. Belyakov, Synthesis, molecular structure and biological activity of bromobenzylgermatranes, J. Organomet. Chem., 659, 165- 171 (2002). E. Abele, O. Dzenitis, J. Popelis, and E. Lukevics, Novel fluoride ion mediated