1. Department of Chemistry, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany
2. UoN Chair of Oman's Medicinal Plants and Marine Natural Products, University of Nizwa, P.O. Box 33, Postal Code 616, Birkat Al Mauz, Nizwa, Sultanate of Oman
3. Department of Chemistry, University of Malakand, Chakdara, Dir (L), KPK, Pakistan
4. Department of Chemistry, Quaid-i-Azam University, 45320 Islamabad, Pakistan
5. Department of Chemistry and Polymer Science, University of Stellenbosch, P/Bag X1, Matieland 7602, South Africa
6. Institute of Microbiology, University of Braunschweig, Spielmannstraße 7, 38106 Braunschweig, Germany