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Yu Zhang,1– 3,* Li Cui,2,* Yizeng Lu,4 Jixiang He,5 Hidayat Hussain,6 Lei Xie,4 Xuan Sun,2 Zhaoqing Meng,7 Guiyun Cao,7 Dawei Qin,1 Daijie Wang2,3 1School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, People’s Republic of China; 2School of Pharmaceutical Sciences and Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, People’s Republic of China; 3Biological Engineering Technology Innovation Center of Shandong Province, Heze Branch of Qilu University of Technology (Shandong Academy of Sciences), Heze, 274000, People’s Republic of China; 4Shandong Provincial Center of Forest and Grass Germplasm Resources, Jinan, 250102, People’s Republic of China; 5School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250353, People’s Republic of China; 6Department of Bioorganic Chemistry, Leibniz Institute of Plant BioChemistry, Halle, D-06120, Germany; 7Shandong Hongjitang Pharmaceutical Group Co., Ltd., Jinan, 250103, People’s Republic of China*These authors contributed equally to this workCorrespondence: Dawei Qin, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, People’s Republic of China, Tel/Fax +86 53189631208, Email qdw@qlu.edu.cn Daijie Wang, Biological Engineering Technology Innovation Center of Shandong Province, Heze Branch of Qilu University of Technology (Shandong Academy of Sciences), Heze, 274000, People’s Republic of China, Tel +86 53182605319, Fax +86 53182964889, Email wangdaijie@qlu.edu.cnBackground: The leaves of L. japonica (LLJ) are widely used as medicine in China. It is rich in caffeoylquinic acids, flavonoids and iridoid glycosides and has strong reducing capacities. Therefore, it can be used

Yu Zhang,1– 3,* Li Cui,2,* Yizeng Lu,4 Jixiang He,5 Hidayat Hussain,6 Lei Xie,4 Xuan Sun,2 Zhaoqing Meng,7 Guiyun Cao,7 Dawei Qin,1 Daijie Wang2,3 1School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, People’s Republic of China; 2School of Pharmaceutical Sciences and Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, People’s Republic of China; 3Biological Engineering Technology Innovation Center of Shandong Province, Heze Branch of Qilu University of Technology (Shandong Academy of Sciences), Heze, 274000, People’s Republic of China; 4Shandong Provincial Center of Forest and Grass Germplasm Resources, Jinan, 250102, People’s Republic of China; 5School of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, 250353, People’s Republic of China; 6Department of Bioorganic Chemistry, Leibniz Institute of Plant BioChemistry, Halle, D-06120, Germany; 7Shandong Hongjitang Pharmaceutical Group Co., Ltd., Jinan, 250103, People’s Republic of China*These authors contributed equally to this workCorrespondence: Dawei Qin, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, People’s Republic of China, Tel/Fax +86 53189631208, Email qdw@qlu.edu.cn Daijie Wang, Biological Engineering Technology Innovation Center of Shandong Province, Heze Branch of Qilu University of Technology (Shandong Academy of Sciences), Heze, 274000, People’s Republic of China, Tel +86 53182605319, Fax +86 53182964889, Email wangdaijie@qlu.edu.cnBackground: The leaves of L. japonica (LLJ) are widely used as medicine in China. It is rich in caffeoylquinic acids, flavonoids and iridoid glycosides and has strong reducing capacities. Therefore, it can be used