1. Institute
of Natural Products Chemistry, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, 122100 Cau Giay, Hanoi Vietnam
2. Institute
of Pharmacy, Hue University of Medicine and Pharmacy, Ngo Quyen
Street, 47000 Hue, Vietnam
3. Dipartimento
di Scienze della Vita, Università di Siena, via A. Moro
2, 53100 Siena, Italy