1. Key
Laboratory of Synthetic and Natural Functional Molecule Chemistry
of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, P. R. China
2. Department
of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
3. Department
of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10 000 Zagreb, Croatia