1. Crystal Engineering Unit
2. Department of Chemistry
3. Faculty of Applied Sciences
4. Cape Peninsula University of Technology
5. South Africa
6. Centre for Supramolecular Chemistry Research
7. University of Cape Town
8. Rondebosch 7701
9. Institut für Organische Chemie
10. TU Bergakademie Freiberg
11. Sachs
12. D-09596 Freiberg
13. Germany