Acta Crystallogr Sect E Struct Rep Online 2013 Apr 2;69(Pt 4):o476-7. Epub 2013 Mar 2.
Chemistry Department, Faculty of Science, King Khalid University, Abha 61413, PO Box 9004, Saudi Arabia ; Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, 11884, Egypt.