Janwitayanuchit, Wicharn; Suwanborirux, Khanit; Patarapanich, Chamnan; Pummangura, Sunibhond; Lipipun, Vimolmas; Vilaivan, Tirayut Phytochemistry, 2003, vol. 64, # 7 p. 1253 - 1264 doi: 10.1016/j.phytochem.2003.09.008