1. School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China
2. Institute of Organic Chemistry and Biochemistry v.v.i., The Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
3. Regional Centre of Advanced Technologies and Materials, Palacký University, 78371 Olomouc, Czech Republic
4. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, United States
5. Departamento de Química, Instituto Tecnológico de Aeronáutica, São José dos Campos, 12228-900 São Paulo, Brazil