1. Merck KGaA Frankfurter Str. 250, 64293 Darmstadt, Germany
2. Institute
of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, 35392 Giessen, Gemany
3. Department
of Organic Chemistry, Kiev Polytechnic Institute, Pr. Pobedy 37, 03056 Kiev, Ukraine