University of Karachi (UoK) – Associate Member Prof. Dr. Muhammad Iqbal Choudhary Director, H.E.J. Research Institute of Chemistry Karachi‑75270, Tel.: +92 21 482 49 24-5 or +92 21 481 90 10 E-mail: hej@cyber.net.pk or iqbal.choudhary@iccs.edu