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Hu, Jiang; Mao, Xia; Zhang, Lifang; Jin, Nianhua; Yin, Si; Peng, Tianfeng; Shi, Junyou . (2019). Indole Alkaloids from the Aerial Parts of Kopsia fruticosa. Chemistry of Natural Compounds, (), –. doi:10.1007/s10600-019-02725-4 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research