1. College of Horticulture and Landscape Architecture, Tianjin Agricultural University, Tianjin 300392, P. R. China
2. State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
3. Key Laboratory for Chemical Pesticide of Shandong Province, Shandong Academy of Pesticide Sciences, Jinan 250100, P. R. China
4. College of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin 300193, P. R. China