1. Department of Chemistry College of Science, King Saud University Riyadh Saudi Arabia
2. Department of Studies in Botany Davangere University Davangere India
3. Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia Universidad Complutense Madrid Spain
4. Department of Organic Chemistry, School of Chemistry Madurai Kamaraj University Madurai India