Plant material
Barleria lupulina Lindl. was collected in September 1999 from the Botanical gardens, Faculty of Pharmaceutical Sciences, Khon Kaen University, Thailand. The identification of the plant was confirmed byProf.Vichiara Jirawongse, Department of Pharmaceutical Botany and Pharmacognosy, Faculty of Pharmaceutical Sciences, Khon Kaen University. A voucher sample (KKU-0018) is kept in the Herbarium of the Faculty of Pharmaceutical Sciences, Khon Kaen University, Thailand