1. Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Material Science, Hebei Normal University Shijiazhuang Hebei 050024 China
2. Department of Environment and Chemical Engineering, Hebei College of Industry and Technology Shijiazhuang Hebei 050091 China
3. Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences, The University of Auckland Private Bag 92019 Auckland 1142 New Zealand