1 Department of Pharmacy , Faculty of Medicine , University of Malaya , 50603 Kuala Lumpur , Malaysia . Email: buckle@um.edu.my ; Email: chungly@um.edu.my ; ; Tel: +60 3 79674959.
2 Department of Chemistry , Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia.
3 School of Pharmacy , Ningxia Medical University , Yinchuan , 750004 , P. R. China.
4 Department of Pharmacology , Yong Loo Lin School of Medicine , National University of Singapore , 117597 , Singapore.
5 Department of Oral Biology and Craniofacial Sciences and Oral Cancer Research and Coordinating Centre , Faculty of Dentistry , University of Malaya , 50603 Kuala Lumpur , Malaysia.
6 Penang Medical College , 4 Jalan Sepoy Lines , 10450 George Town , Pulau Pinang , Malaysia.