1. Natural Products Research Laboratory,
School of Science, Mae Fah Luang University, Tasud, Muang, Chiang Rai 57100, Thailand
2. Department of Chemistry, Faculty
of Science, Chiang Mai University, Sutep,
Muang, Chiang Mai 50200, Thailand
3. School of Science, University of Phayao, Maeka, Muang, Phayao 56000, Thailand