1. Department of Chemistry , Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris , 35900 Tanjong Malim , Perak , Malaysia
2. Department of Pure and Industrial Chemistry , Faculty of Natural and Applied Sciences, Umaru Musa Yar’adua University , Katsina , Nigeria
3. Department of Chemistry , The University of Alabama in Huntsville , Huntsville , AL 35899 , USA
4. Aromatic Plant Research Center , 230 N 1200 E, Suite 102 , Lehi , UT 84043 , USA