1. Chemistry Department, College of Science, Taibah University, Al-Madinah Al-Munawarah, Saudi Arabia
2. Vitamin Section, The National Organization for Drug Control and Research, Giza, Egypt
3. Department of Chemistry, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa, 31982, Saudi Arabia
4. Department of Chemistry, Ain Shams University, 11566, Abbassia, Cairo, Egypt