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Eisenreich, Wolfram J.; Bracher, Franz . (2001). Crotoflavol, A New Phenanthrene from <i>Croton flavens</i>. Natural Product Letters, 15(2), 147–150. doi:10.1080/10575630108041272 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research