Zhao Guanghui: Male, born in February 1964, People's Republic of China (PRC) nationality, no permanent residence abroad, MBA from Nankai University, chairman and general manager of the company from April 2008 to April 2020, and now chairman of the company. Mr. Zhao Guanghui is the founder of the company's oxalic acid series product technology, and has presided over the research and development of many core technologies of the company for many years. Mr. Zhao Guanghui is currently the vice president of the 13th Chamber of Commerce of Shandong Federation of Industry and Commerce and a member of the Standing Committee of Zaozhuang Municipal People's Congress.