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Vyvyan, James R.; Holst, Christian L.; Johnson, Allison J.; Schwenk, Cheryl M. . (2002). Total Synthesis of Gibbilimbols A−D. The Journal of Organic Chemistry, 67(7), 2263–2265. doi:10.1021/jo0162991 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research