1. Department
of Organic Chemistry, University of Debrecen, POB 20, 4010 Debrecen, Hungary
2. Leibniz-Institute
for Natural Product Research and Infection Biology, Hans-Knöll-Institute (HKI), D-07745 Jena, Germany
3. Institute
for Tuberculosis Research, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States